(covers information from several alternate timelines)
A glove was a piece of clothing covering the whole hand.
Background information Edit
In the script for Star Trek VI, the judges' gavel glove in that film was described as "a grotesque mailed glove." 
A concept drawing of the Star Trek VI gavel glove was created by Nilo Rodis-Jamero. (The Art of Star Trek, p. 267) The glove was made out of molded fiberglass, weighed about ten pounds, and could actually be worn as a massive glove. ("Penny's Toy Box", Star Trek VI: The Undiscovered Country (Special Edition) special features) Since the actor playing the Klingon judge (Robert Easton) had arthritis, the glove had to be customized for the performer by making it softer to wear. Greg Jein remarked, "We had to hollow half of it out and pad it up." (The Making of the Trek Films, 3rd ed., p. 128)