This kanji may have descended from a representation of some kind of building, which was used phonetically for the number six.

Vocabulary

Vocabulary Reading Meaning
⭐ 六 ろく six
⭐ 六つ むっつ six things
六日 むいか sixth day of the month; six days
六月 ろくがつ June
六法 ろっぽう the six codes of law
丈六 じょうろく a kind of statue of the Buddha
六月目 むつきめ the sixth month
六つ切り むつぎり dividing into six pieces