Day trading terminology is the shorthand traders use for orders, market data, price action, risk, and the rules that govern margin accounts. You need roughly 80 terms, not 500, and this page defines them the way traders use them mid-sentence, grouped by where they show up in a trading day.
One thing up front: this glossary is current on the 2026 rule change. The pattern day trader rule and its $25,000 minimum are gone, replaced by intraday margin requirements, and the accounts section below covers the new terms with the FINRA citations. Most glossaries still define the old rule as if it were law.
Knowing the vocabulary makes scanners, Level 2, and trading chat readable. It does not make you profitable. Most day traders lose money, and fluency in the jargon changes nothing about that. Learn the words so you can judge what you’re looking at, not so you can sound like you belong.
The trading day: sessions and setups
Premarket. The session before the 9:30 a.m. ET open. Liquidity is thin, spreads are wide, and this is where gappers build the highs and lows that matter at the open. More in our guide to premarket trading.
The open. The first stretch after 9:30 a.m. ET. Highest volume, fastest moves, most opportunity, most damage. Many day traders work the open and are done by late morning.
Regular session. 9:30 a.m. to 4:00 p.m. ET, Monday through Friday, with early closes around some holidays.
After hours. The session following the 4:00 p.m. close. Thin, like premarket, and it’s where earnings reactions start.
Power hour. The last hour into the close, when volume comes back after the midday lull.
Gap up / gap down. A stock opens above or below the prior day’s close, almost always on news. A stock doing this is a gapper.
Catalyst. The reason a stock is moving: earnings, FDA news, a contract, an offering, a short report. No catalyst, no conviction.
In play. A stock with a catalyst trading far more volume than normal. In-play names are where intraday moves get follow-through; dead ones drift.
Former runner. A stock that has made violent intraday moves before. Traders track them because the same names tend to run again.
Chop. Directionless back-and-forth, classically from late morning to early afternoon. It’s a chop fest after 11; most traders are better off done by then.
Orders and execution
Bid / ask / spread. The bid is the highest price posted buyers will pay; the ask is the lowest posted sellers will take; the spread is the gap between them. The spread is a cost you pay on entry: a 10-cent spread on 500 shares is $50 gone before the trade does anything.
Market order. Fill me now at whatever’s there. Fine on thick, liquid names. On a thin stock it’s how you get filled 40 cents above the last print.
Limit order. Fill me at this price or better. You control price; you give up the guarantee of a fill.
Marketable limit order. A limit priced at or through the current ask (or bid, if selling). You get the speed of a market order with a ceiling on the damage. For most day traders, this is the default entry.
Stop order / stopped out. An order that triggers when price crosses your level. A stop-market always gets you out but can slip in a fast tape; a stop-limit protects the price but can leave you holding through it. Getting stopped out means your stop fired.
Mental stop. A stop you keep in your head instead of on the server. Only as good as your discipline, which is exactly the problem.
Fill / partial fill. The fill is the price your order actually executed at. A partial fill is getting 300 shares of the 1,000 you wanted because price moved before the rest could execute.
Slippage. The difference between the price you expected and the price you got. Fast markets, thin stocks, and wide spreads all make it worse.
Hit the bid / sell the ask. Hitting the bid is selling immediately to the posted buyers. Selling the ask is posting your shares at the ask and waiting for a buyer; you get a better price if the stock holds.
Chasing. Entering after the move has already gone. Chased entries have the worst price and the closest stop to danger.
Starter / add / scale in / scale out. A starter is a small opening position. Adding or scaling in builds it; scaling out sells it in pieces. Taking some off the table means selling part to lock in profit while the rest works.
Average down. Adding to a losing position to lower your cost basis. Investors argue about it; for day traders it’s mostly how small losses become account-sized ones. Good money after bad.
Cover. Buying back shares to close a short position.
Hotkeys. Keyboard-mapped orders that fire instantly: buy 500 at the ask, sell half, flatten everything. Standard equipment for fast traders, and a known way to fat-finger an order you didn’t mean.
Routes / direct routing / smart routing. Where your order gets sent. Smart routing lets the broker choose; direct routing lets you pick the exchange or ECN. The difference matters most at direct access brokers, covered in direct access vs retail brokers.
Market structure and data
Level 1. The current best bid and ask. What every basic quote shows.
Level 2 / market depth. The full ladder of bids and asks below and above the current price, with sizes and routes. Full breakdown in our Level 2 quotes explainer.
Time and sales / the tape. The running print of every executed trade: price, size, time. Green on the tape means prints going off at the ask (buyers paying up); red means prints at the bid (sellers hitting out).
Volume. Shares traded. Raw volume means little without context, which is why traders watch the next term instead.
Relative volume (RVOL). Today’s volume compared to the stock’s average for the same time of day. RVOL of 1.0 is normal; an in-play stock might be at 5 or 10. It’s the single fastest read on whether a stock is worth your attention.
Float / low float. The shares actually available to trade. A low float plus real demand is how a stock moves 50% in a morning, in either direction. More in float and volume.
Liquidity / thin vs thick. Liquidity is how much you can trade without moving the price. Thick stocks absorb size with tight spreads; thin ones have 20 to 30 cent spreads that punish every entry and exit.
Market makers. Firms that post both bids and asks and profit from the spread.
ECNs. Electronic communication networks: the venues that match buyers and sellers. ARCA and EDGX are routes you’ll see constantly on the tape.
Dark pools. Private venues where institutions trade without displaying orders. Those shares exist, but you can’t see them on Level 2.
Payment for order flow. Brokers selling their customers’ orders to wholesale market makers for execution. It’s how zero-commission brokers get paid.
Short interest. The percentage of the float currently held short. High short interest is the fuel for the next term.
Short squeeze. Shorts forced to buy back as price rises, which pushes price higher, which forces more buying. The feedback loop behind the most violent upside moves.
Locates / hard-to-borrow. To short, your broker has to locate shares to lend you. Easy-to-borrow stocks cost little; hard-to-borrow names carry locate fees that can eat the whole trade. Details in short locates explained.
Short sale restriction (SSR). Triggers when a stock falls 10% from the prior close. For the rest of that day and the next, short sales are only allowed above the current best bid. It doesn’t stop shorting; it stops shorting into weakness.
Halt / circuit breaker. Trading in the stock pauses, typically for five minutes, when price moves outside its volatility bands under the limit up-limit down rules. Stocks can reopen far from where they halted, and your stop order does nothing while trading is paused.
Price action and chart terms
Candlestick. One bar showing open, high, low, and close for the period. The body is open-to-close; the wicks (also called tails) are the extremes.
Topping tail / bottoming tail. A long upper wick means price spiked and got sold back down: sellers up there. A long lower wick is the reverse. A doji has a tiny body and long wicks, reading as indecision. A hammer is a long bottoming tail after a downtrend, the classic reversal candle.
Key level. A price where the stock has repeatedly reacted: prior highs and lows, daily levels, big round numbers. Half and whole dollars act as magnets and battlegrounds on lower-priced stocks.
High of day (HOD) / low of day (LOD). The session’s extremes, and two of the most-watched levels on any in-play stock.
Breakout / false breakout. Price clearing a key level with volume is a breakout. Price poking through, sucking in buyers, and reversing is a false breakout, and it traps everyone who chased.
Pullback. A controlled dip within a move. Buying the pullback beats chasing the spike: better price, tighter stop.
Bull flag / bear flag. A sharp move, then a tight, drifting consolidation against it, then often a continuation. The bear flag is the mirror image. “Bear flagging” describes a stock grinding sideways-down before the next leg lower.
Flush. A fast, heavy sell straight down, often through a key level or to the low of day.
Squeeze / rip / parabolic. Escalating words for fast upside. Parabolic means the move has gone vertical, which is usually closer to the end than the beginning.
Fade. Trading against the move: shorting the rip, buying the flush. Also used for a stock slowly bleeding off its highs (“it faded all afternoon”).
Bounce / reclaim. A bounce is the reaction up off a flush. A reclaim is price recovering a broken level and holding above it, which flips that level back to support.
Red-to-green. A stock that opened below the prior close crossing back above it. The opposite move is green-to-red. Both are momentum triggers traders set alerts on.
VWAP. Volume-weighted average price: the day’s average price weighted by where the volume actually traded. Above VWAP, buyers are in control; below it, sellers. An anchored VWAP starts the calculation from a chosen event instead of the open.
Moving averages / 9 EMA / 200 EMA. Averages of price over a lookback window, drawn on the chart. The 9 EMA tracks fast momentum intraday; the 200 EMA (or 200 SMA on the daily) is the classic big-picture line.
Multi-timeframe alignment. The 1-minute, 5-minute, and daily charts agreeing. Setups that align across timeframes carry more weight than a pattern on one chart fighting the others.
Trend. The market’s prevailing direction. Don’t fight it, and let winners work while it holds.
Risk and money management
Risk-reward (R/R). Potential profit measured against what you’re risking. Risking $0.50 to make $1.00 is two-to-one. The math is the whole point: at two-to-one, a 40% win rate over ten trades risking $50 each makes $400 on the four winners and loses $300 on the six losers. Profitable while losing more often than winning. Run your own numbers in the risk-reward calculator.
Risk per trade / position sizing. Decide the dollar risk first, then derive share size from the stop distance. A $5,000 account risking 1% is $50 a trade: with a stop 25 cents below entry that’s 200 shares, with a stop $1.00 below it’s 50 shares. Size is an output, not a feeling. The position size calculator does the arithmetic.
Max loss / daily max loss. The most you’ll lose on one trade, and the most you’ll lose in one day before you walk away. The daily number is the one that keeps a bad morning from becoming a blown account.
Drawdown. The decline from your account’s peak. Every trader has them; the size and your response decide whether they’re survivable.
Blow up. Losing the account, or enough of it that the question is academic. Usually the result of oversizing, averaging down, or trading without stops, and frequently all three at once.
Base hit. A small, repeatable winner. The traders who last tend to stack base hits and keep losers smaller. Rinse and repeat.
Win rate / profit factor. Win rate is the percentage of trades that make money. Profit factor is gross profits divided by gross losses; above 1.0 you’re net profitable. Neither means much alone: a 70% win rate with occasional huge losers can still bleed out.
Paper trading / sim. Trading with fake money on live or replayed data. Useful for learning the mechanics and your platform; it can’t replicate what real losses do to your decision-making.
Backtesting. Running a strategy’s rules against historical data to see how it would have performed. Honest backtests account for slippage and commissions; dishonest ones are advertising.
Watchlist. The short list of names you’re stalking today, usually built premarket from the gappers and catalysts.
Scanner / screener. A screener filters stocks on static criteria; a scanner alerts you in real time as stocks trigger conditions: new highs, RVOL spikes, halts. Day traders mean the real-time kind.
Trading journal. The record of every trade: setup, entry, exit, size, and what you were thinking. It’s the only honest mirror in this business. Start with our free trading journal template.
Accounts, margin, and the 2026 rules
This is the section most glossaries get wrong now. FINRA replaced the day trading margin rules, including the pattern day trader framework, with intraday margin requirements effective June 4, 2026, with a transition period for brokerage firms running through October 20, 2027. The terms below reflect the new regime, verified against FINRA’s published guidance in June 2026.
Cash account. You trade only the cash you’ve deposited, with no leverage and no borrowed shares. The constraint is settlement: sale proceeds aren’t yours to redeploy until the trade settles.
Settlement (T+1). Stock trades settle one business day after the trade date, a cycle in effect since May 28, 2024. In a cash account, that’s the wait before sold funds can be reused without violations.
Margin account. The broker extends credit against your equity, which lets you reuse capital without waiting for settlement and, above the minimum, trade with leverage. It’s the standard account type for day trading, and it’s where the intraday margin rules apply.
Leverage. Trading with more exposure than your cash by borrowing against your account. FINRA sets $2,000 as the minimum equity to trade leveraged in a margin account; below that you can still trade, but only unleveraged, with the cash you have.
Buying power. Your cash plus whatever margin your firm extends. Under the new rules there’s no fixed day-trading multiple written into the rulebook; the binding constraint is holding enough equity against your open positions throughout the day, and your firm sets the specifics.
Maintenance margin. The minimum equity you must hold against positions: 25% of the current market value of long margin-eligible stock, and under the new requirements that floor applies all day, not just at the close. Firms can and do require more.
Margin call. Your firm demanding funds because equity fell below requirements. Ignore it and the firm can liquidate positions for you, at prices you won’t enjoy.
Pattern day trader rule (eliminated). The old regime: firms flagged accounts as pattern day traders based on trade counts and imposed a $25,000 minimum equity requirement to keep day trading. The SEC approved its replacement in April 2026. The full story is in our pattern day trader rule explainer, and you’ll still see the old rule cited as current all over the internet. It isn’t.
Intraday margin requirements. The replacement: no $25,000 minimum, no trade-counting designation. Your firm monitors that your equity covers your positions during the trading day. Fall short and you have an intraday margin deficit, which you’re expected to satisfy as promptly as possible; repeatedly failing to can get the account restricted for up to 90 days. During the transition window some firms still run the old rules, so ask yours which regime applies to you. The mechanics live in intraday margin requirements.
Commissions / per-share pricing. Retail brokers are mostly zero-commission and paid through order flow. Direct access brokers typically charge per share or per trade, plus ECN and locate fees, in exchange for routing control and speed.
Prop firm / funded account. Firms that stake traders with the firm’s capital, usually after a paid evaluation (“challenge”) with profit targets and drawdown limits. You keep a split of profits; the firm keeps the rules. Read the payout terms before the marketing.
Psychology and bad habits
FOMO. Fear of missing out: the urge that produces chased entries at the top of the move. The move you missed was never yours.
Revenge trading. Forcing trades to win back a loss, immediately, with size. It’s how one bad trade becomes a bad week.
Overtrading. Taking trades because you’re at the desk, not because the setup is there. Commissions and slippage compound it quietly.
Bag holder. Someone stuck holding a position far below their cost, hoping. Day traders become bag holders by refusing a stop and “turning it into a swing trade.”
Sizing up too fast. Increasing share size before the process deserves it. The swings get loud, the decisions get worse, and the account pays for the lesson.
Where to go from here
Vocabulary is the cheap part; the sequence that follows it matters more. If you’re starting from zero, work through how to start day trading, which puts these terms in order: education, simulation, a funded account sized for survival, and a journal from trade one. Bookmark this page and come back when a term in a scanner, a chatroom, or a filing doesn’t parse.
Common questions
Which day trading terms should I learn first?
Start with the ones that control your money: bid, ask, and spread; market, limit, and stop orders; position sizing and risk-reward; and the margin terms above. Chart-pattern vocabulary can wait. An order entered wrong costs you immediately; a flag pattern you can’t name costs you nothing.
Is the pattern day trader rule still in effect?
No. FINRA replaced the rule, including the $25,000 minimum equity requirement, with intraday margin requirements effective June 4, 2026. Brokerage firms have a transition period through October 20, 2027, so some still apply the old day trading margin rules for now. Ask your broker which regime your account is under.
What is the difference between a halt and short sale restriction?
A halt stops all trading in the stock, usually for five minutes, when price moves outside its volatility bands. SSR doesn’t stop trading at all; it restricts how shorts can enter. Once a stock drops 10% from the prior close, short sales are only allowed above the current best bid for the rest of that day and the following day.
What does “in play” mean?
A stock is in play when it has a catalyst and is trading far more volume than usual, which is what gives intraday moves follow-through. Scanners exist largely to surface these names premarket and during the session.
What does going flat mean?
Holding no positions, long or short. Day traders go flat by the close to avoid overnight gap risk, and many go flat mid-session after hitting their daily max loss.
Sources
Regulatory definitions on this page were verified in June 2026 against primary sources: FINRA’s investor guidance on the new intraday margin requirements and Regulatory Notice 26-10, which adopted the standards replacing the day trading margin rules; the SEC’s announcement of Rule 201 short sale restrictions; the SEC’s investor bulletin on limit up-limit down volatility halts; and Investor.gov’s bulletin on the T+1 settlement cycle.