(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.

朝飯前: A piece of cake; an extremely simple thing.

(telephony) a common Japanese telephone greeting: hello; used when answering the telephone / used to confirm that the person being addressed is listening, or to confirm if anyone is listening

put away

a highlighter (pen for highlighting)

brush pen; fudepen (ink pen that that mimics the feel of a traditional brush)

magic marker; marker

pen spinning

writer's callus

tailor's-chalk pen