KEEP THE POWDER DRY: To limit your trades due to inclement trading conditions. In either choppy or extremely narrow markets, it may be better to stay on the sidelines until a clear opportunity arises.

KIWI: Nickname for NZD/USD (New Zealand Dollar/U.S. Dollar).

KNOCK-INS: Option strategy that requires the underlying product to trade at a certain price before a previously bought option becomes active. Knock-ins are used to reduce premium costs of the underlying option and can trigger hedging activities once an option is activated.

KNOCK-OUTS: Option that nullifies a previously bought option if the underlying product trades a certain level. When a knock-out level is traded, the underlying option ceases to exist and any hedging may have to be unwound.