You must mean the shamesh. The shamesh is used to light all of the other candles on the menorah. 1st on first day, 2nd on second, etc....
To clarify, the shamesh/shamash doesn't have to be at the centre of the channukiah, the only requirement is that it is higher than the rest of the candles.
the middle of hannaka
a menorah is a candle holder. You can't eat on it.
a candle
there is one main candle in the center, then four on ether side to represent the 8 days the oil lasted.
ordinary wax.
there are nine.
Menorah Medical Center was created in 1931.
It is called the Shamash. It is used to light all of the other candles on the Menorah or Chanukiah.
A menorah can have any design or words on it. It depends on the menorah. There is no rule about this.
The ninth candle in the menorah is called the Shamash (or "helper" in English.)
The Shamash is the candle that lights the other candles
Each candle represents each of the 8 days of Hanukkah.
The traditional name is a menorah. Modern (Israeli) Hebrew has added the name "hanukkiah."See also the Related Link.More about Hanukkah