「八」(hachi) means "eight" or "8". It's used for counting various objects, people, or within larger numbers. For example, 「八つ」(yattsu) means "eight things". It's a fundamental part of the Japanese counting system.

「八」（はち）は「8」を意味します。物を数える時や数量を示す時に使います。例：「八つ」（やっつ）。