whosepronoun
used alone to ask or say which person or thing something belongs to
Whose stands alone when the thing it asks about is already clear from what was just said: There's a phone on the table. Whose is it?
Usage
Before a noun, whose is a determiner, a separate entry: whose coat is this? This entry covers whose standing alone, without a following noun. Do not confuse whose with who's, the short form of who is or who has.