Some kind of Montblanc pen IMO
Instruction to newfag.
When you reply to a post,
just click the post number you're replying to.
That will insert the post number, preceded by two >, into your reply.
When the post number is preceded by >>,
it becomes a link so that others can see what you're replying to.
Don't put # in front of a post number, that is useless.
Welcome. Please lurk moar (read silently) and learn our comms.