From Openwaterpedia

noun - SCM is a swimming acronym for short course meters or a description of a 25-meter competition pool.

Types of Competitive Swimming Pools

SCY or Short Course Yards, a 25-yard pool
LCY or Long Course Yards, a 50-yard pool
SCM or Short Course Meters, a 25-meter pool
LCM or Long Course Meters, a 50-meter pool

External links