A small statue — the kind that sits on a table, a shelf, or a piano, rather than standing outdoors. Size is the whole point of the word: if it is big enough to stand in a square, it is a statue; if you could pick it up and carry it home, it is a statuette. It is a countable noun, so one statuette, two statuettes. The word feels slightly formal — in ordinary talk many people would just say "a little statue" or name the material, "a bronze figure", "a jade carving". You meet statuette most in museums, antique shops, and in writing about prizes: the small gold figure given at a film award ceremony is often called a statuette.