「五」(go) means "five" or "5". It's a basic number used for counting various items, people, or in general numerical expressions. For example, to say "five things," you would use 「五つ」(itsutsu). This is a core number in Japanese counting.

「五」（ご）は「5」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：「五つ」（いつつ）。