Speed of a computer mouse is measured in??????????????

Mickeys:

In a light-hearted nod to the ubiquity of Disney’s Mickey Mouse character, a “Mickey” has been a long standing measurement of mouse movement in the computer industry.

Traditionally, a Mickey is 1/200th of an inch; the term is often used in a modified form to refer to more specific measurements such as pixels-per-Mickey (to indicate how far the cursor moves on the screen relative to the movement of the physical mouse), as well as horizontal Mickey count and vertical Mickey count to refer to horizontal and vertical movements.