From Wikipedia

Yarmulke and Menorah from the Harry S Truman collection

Menorah, is a seven branched candelabrum lit in the Tabernacle and the Temple in Jerusalem.
The menorah is one of the oldest symbols of the Jewish people. It is said to symbolize the burning Bush. The Menorah is also left to fuel the eternal flame.

A theory to the origin of the design of the menorah is based on what is known about ancient Hebrew cosmology.




Menorah incised in marble. Dated 500AD
The Coat of Arms of Israel.