Final answer:
The ninth candle of a Hanukkah menorah, used to light the other candles, is called the Shamash.
Step-by-step explanation:
The extra ninth candle of a Hanukkah menorah is called the Shamash. It is also known as the "attendant" or "servant" candle and it is used to light the other candles of the menorah.
There are eight candles that represent the eight nights of Hanukkah, where a new candle is lit each night. The Shamash is typically elevated or otherwise set apart from the other eight candles to distinguish its role.