An area, open to the sky, partially or wholly surrounded by walls or buildings.
A wing.
Penitentiary, i.e. a state or federal prison for convicted felons.
The internal cartilage skeleton of a squid, shaped like a pen.
An enclosure (enclosed area) used to contain domesticated animals, especially sheep or cattle.
A female swan.
Penalty.
A writer, or their style.
The bullpen.
Marks of ink left by a pen.
A light pen.
A tool, originally made from a feather but now usually a small tubular instrument, containing ink used to write or make marks.
To enclose in a pen.
To write (an article, a book, etc.).