Drive by posting, but:
Geo, the middle candle of the Chanukiah (menorah we use for Chanukah) is the 'shamash' or 'service' candle. It is always higher or set apart from the other eight candles and is used to light the others. The menorah that was used in the Temple(s) had 7 total branches, including the shamash. The Chanukiah has eight branches on either side to commemorate the miracle of the oil (after the rededication of the Temple when the Hasmonean brothers/Maccabees reconquered Jerusalem from the Seleucid Assyrian King Antiochus IV, they found the Temple in ruins and the oil the priests used for the menorah all desecrated. They found one pach -- jar -- of consecrated pure oil, enough for only one day/night, and lit it. The miracle was it lasted for eight full days and nights, until more could be produced/consecrated).