T is for Toggle

Photo of a toggle clasp
Wayne Noffsinger / CC BY-SA

Tis forToggle (Joint)

A toggle clasp is made from a rod that is put through a ring or loop.
Jewelry
Photo of a toggle switch
r. nial bradshaw / CC BY-SA

Tis forToggle (Switch)

You toggle between two states of something when you switch from one to the other.