hat is my pen

Do you mean “Where is my pen?” or something else like “What is a pen?” If you meant finding it, here are quick steps:

• retrace your last use: where did you last remember using it?
• check common spots: your desk, your notebook, inside any bags/pockets, coat pockets, the chair you were sitting in.
• search systematically: divide the room into zones and scan each area slowly; look under papers, between book pages, and in pencil cases or drawers.
• don’t forget small places: desk organizers, computer stand trays, between cushions, or under papers.
• if you still can’t find it, try a quick reset: empty a single likely spot (bag or desk tray) and re-check.

If you meant something else by “pen” (definition, types, pen name, etc.), tell me and I’ll tailor the answer.