Wiktionary
suspended cymbal
n. (context musical instruments English) a cymbal that is suspended horizontally and usually played with one or two sticks
Wikipedia
Suspended cymbal
right|thumb|Classical suspended cymbal
A suspended cymbal is any single cymbal played with a stick or beater rather than struck against another cymbal. Common abbreviations used are "sus. cym.," or "sus. cymb." (with or without the period).
Most drum kits contain at least two suspended cymbals: a crash cymbal and a ride cymbal.