The seven lamps allude to the branches of human knowledge, represented by the six lamps inclined inwards towards, and symbolically guided by, the light of God represented by the central lamp. The menorah also symbolizes the creation in seven days, with the center light representing the Sabbath.
7 Branches: The 7 branches are a symbol of completion. The number 7 is a recurring theme in Judaism: the 7 days of creation, the holy Sabbath – the 7th day of the week (represented by the Menorah’s central branch), the 7 days of mourning (Shiva)… https://amenvamen.com/menorah-vs-chanukiah
Light: According to the Talmud, the Menorah is a symbol of enlightenment. The central branch represents the light of God, emanating light to the other six branches – a symbol of human knowledge. Light is often used in Judaism as a metaphor for wisdom and divine emanations.