- a person or thing that taps or strikes lightly.
- a telegraph key.
- a person or thing that taps, as trees for the sap or juice, a blast furnace, cask, or other container for their contents, etc.
- a person who cuts screw threads into the surface of a circular opening, as of a pipe, nut, etc.
- a person who taps
- a tool or instrument that taps
- an unstable and violent person
