For the nickname given to someone who is cool under pressure, please see Ice man.
Icemen were a mythical race of great strength that were believed to live in the Vellorian Mountains of the planet Barkon IV, where a pre-industrial civilization existed.
After suffering amnesia from a shuttle accident, Talur, a native of the planet, erroneously claimed the android Lieutenant commander Data to be an ice man because of his pale physical features. (TNG: "Thine Own Self")