The kanji 五 (go) fundamentally represents the number "five." It's a direct representation of the quantity or the concept of having five units of something.

・On-yomi (音読み): ゴ (go) ・Kun-yomi (訓読み): いつ (itsu)

⚫︎ 五月 Translation: May ⚫︎ 五時 Translation: 5 o'clock ⚫︎ 五人家族 Translation: a family of five

The kanji 五 (go) is a pictograph. It depicts the five fingers of a hand. The character’s form evolved from an image of five lines.