Initialism of rapid eye movement.

(music) Initialism of remaining time.

(computing) A remark (programming language statement used for documentation).

(chemistry) Abbreviation of rare earth metal..

Abbreviation of reactive electrochemical membrane.

(often capitalized) Initialism of rapid eye movement, a sleep state.

A dose of absorbed radiation equivalent to one roentgen of X-rays or gamma rays

(computing) A remark; a programming language statement used for documentation (in BASIC for example); also used in DOS batch files.

(knitting) remaining

(web design) A unit relative to the declared font size of the root element in a HTML document.