Scissors were hand-operated shearing tools.
Susan Foreman kept at least one pair of scissors in her room on the TARDIS. She threatened Ian Chesterton with them, but only stabbed them harmlessly into her bed. (TV: The Edge of Destruction)
The First Doctor had a pair of scissors which he used to cut a rose from a bush. (PROSE: Roses)
To demonstrate the cause of the stalemate of the Dalek-Movellan War, the Fourth Doctor and Romana played a game involving hand shapes forming "stone", "paper" and "scissors"; the latter was represented by a fist with the index finger and middle finger extended. (TV: Destiny of the Daleks)