The kanji 口 口 fundamentally represents the "mouth". It's a pictograph, a visual representation, of the opening through which we speak, eat, and drink. The character encapsulates the idea of an opening or an entrance.

・On-yomi (音読み): コ (ko) ・Kun-yomi (訓読み): くち (kuchi)

⚫︎ 人口 (jinkou) Translation: Population (literally "people mouth") ⚫︎ 入口 (iriguchi) Translation: Entrance (literally "enter mouth") ⚫︎ 口頭 (koutou) Translation: Oral; verbal (literally "mouth head")

The kanji 口 口 is a very simple pictograph. ⚫︎ It directly depicts the shape of a mouth, as viewed from the front. ⚫︎ Over time, the depiction has become simplified to the rectangular shape we see today, but the original intent to represent the mouth's opening remains clear.