noun, noun or participle which takes 'suru', transitive verb, noun which may take the genitive case particle 'no'
combined use; multi-purpose; serving two purposes
Used for items, spaces, or systems designed to serve more than one function. Often appears in compounds like 兼用住宅 (dual-purpose house) or 兼用炊飯器 (multi-use rice cooker).
この部屋は書斎と客間を兼用している。
This room serves both as a study and a guest room.
兼
It's a unit bath with a combined-use washbasin.