plural of dichotomous key

(aviation, slang) The large white striped section at the ends of a runway, used as a landing aiming point and as a distance indicator.

A very simple design of key that usually has a cylindrical shaft (sometimes called a "shank") and a single, minimal flat, rectangular tooth or "bit".

(music) A key using alternative fingerings for certain notes on woodwind instruments. Specifically, a key that is located between the first and second keys operated by the left hand on a saxophone. Pressing LH1 and the bis key simultaneously results in the sounding of a Bb. This is especially useful when playing in keys with many flats.

(colloquial) Nervous; worried.

A restrained or subdued situation. / (photography) A dark area of a photograph with little contrast.

(informal) Alternative spelling of low-key

(databases) A column (or group of columns) in a relational table that identifies another table, so that items in the two tables can be conceptually linked.

The unpublished key in asymmetric cryptography.

plural of public key