Definitions

1. noun

A symbol or a short name for a system, especially a computer system.

“The sym for the university’s computer network is ‘UUN’.”

2. noun

A short musical composition, typically for solo instrument.

“The sym by Mozart is a classic piece of music.”

3. acronym

An acronym for ‘symmetric’.

“The term ‘sym’ is often used in physics to describe symmetric systems.”