Enough to fill a pen.

A surname.

A pen, often with a thick tip made of felt.

(computing, informal) A penetration test.

(computer hardware) A pen-like device allowing a computer user to interact with the screen display.

A fine eraser, user to erase individual lines of written text

(idiomatic) A mistake in handwriting.

A fountain pen in which the ink is drawn from replaceable cartridges.

plural of pen test

(informal, often derogatory) A person who performs routine office work, involving mainly paperwork.