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A break-even stop is a manual or automated move of your SL to entry price once price has moved a certain distance in your favour. Once moved, the worst case is zero (minus spread/commission).

Also called: BE stop

Dark pools let institutions move large blocks without telegraphing intent to the wider market — preventing other traders from front-running the order.

Also called: ATS, alternative trading system

FOK is an execution instruction used mostly in institutional and ECN trading. The order must fill in full, at the specified price, the instant it hits the venue — otherwise it's cancelled.

Also called: FOK

GTC is the default expiry behaviour for most retail FX brokers — pending orders sit until they fill, you cancel them, or some far-future broker-enforced limit (often 90 days).

Also called: GTC

An iceberg order splits a large order into smaller visible slices. As each slice fills, the next is revealed — the total order size stays hidden from other participants.

Also called: hidden order, reserve order

IOC is FOK's looser cousin: any amount that can fill immediately at your price does; the rest is cancelled rather than left as a working order.

Also called: IOC

A limit order tells the broker: only fill me at this price or better. Buy limits sit below the current market; sell limits sit above.

Also called: limit buy, limit sell

In FX, liquidity is fragmented across banks, ECNs, and prime brokers. Liquidity pools (or LPs) aggregate these sources so retail brokers can offer one combined price.

Also called: LP, liquidity provider

A market order is the simplest instruction you can send to a broker: execute immediately at whatever price is available. Buy orders fill at the ask, sell orders at the bid.

Also called: market buy, market sell, at market

OCO ('one-cancels-other') lets you set two opposing or alternative orders that share a single allocation of risk. Most commonly used for bracket orders: place a take-profit limit and stop-loss stop on the same position — one fills, the other dies.

Also called: one cancels other, bracket order

Order flow analysis studies the actual orders entering the market — size, aggression (market vs limit), and direction — rather than just looking at price on a chart.

Also called: tape reading, DOM trading

A partial fill leaves the rest of your order working (or cancelled, depending on the order type — IOC cancels the remainder, GTC keeps it).

Pending orders are price-conditional instructions that wait in the broker's order book until the trigger condition is met. The four standard types are buy limit, sell limit, buy stop, and sell stop.

A requote happens when a dealing-desk broker can't (or won't) execute your order at the price you saw. Instead of filling, they pop up a new price and ask you to confirm.

Also called: price re-quote

Slippage happens when the market moves between the moment your order is sent and the moment it's executed. It can be negative (filled worse than expected) or positive (filled better — yes, that's possible).

Also called: execution slippage

Slippage = fill price − expected price

Stop Loss (SL) is the single most important risk-control tool in trading. It defines the worst case for a trade before you take it, and removes the emotional 'just one more pip' decision when price moves against you.

Also called: SL, stop, protective stop

Position size (lots) = Account risk ($) ÷ (Stop distance × pip value per lot)

A stop order sleeps until price touches a trigger level, then converts to a market order. Buy stops sit above current price (breakout entry); sell stops sit below (breakout entry or protective exit).

Also called: stop, stop-market, stop entry

Trigger: Buy stop fires when ask ≥ trigger price
Sell stop fires when bid ≤ trigger price

A stop-limit combines the trigger of a stop with the price guarantee of a limit. When price touches the stop, the broker submits a limit order at the specified limit price (which can differ from the stop).

Also called: SL order

Take Profit (TP) automates the exit on winning trades. Set when you open the position, it sits as a limit order on the opposite side and executes the moment price touches your target.

Also called: TP, profit target, target

A trailing stop is a stop-loss order with a dynamic level. It moves with price in your favour but never moves against you. You define the trail distance (in pips, ticks, or %); the broker handles the rest.

Also called: trailing SL

New stop = max(old stop, current price − trail distance)  (for long positions)