Ice

Ice is the solid form of water, formed at temperatures below 0 &deg;C. Comets consist mostly of ice. 

Thy'lek Shran felt that while Vulcans said that the desert teaches men the meaning of endurance, it was ice that forged real strength. 

In 2270, an entire deck of the USS Enterprise (NCC-1701) was covered with ice. James T. Kirk and Spock slipped on it. 

Ice can be used for medicinal purposes, notably to reduce swelling. 

It can also be used for cooling drinks such as martinis and champagne. 

An icicle is a spike of ice formed from the freezing and thawing of falling water. While being held prisoner in the freezing cold rec room by the Enterprise main computer, Leonard McCoy suggested that he, Hikaru Sulu and Nyota Uhura move before they turned into icicles. Intendant $𝜇$ once told Benjamin Sisko that she knew of Breen icicles warmer than $𝜇$.

The entity Q used his powers and "iced" first Lieutenant Torres and later Natasha Yar. Both were recovered a short time later.