What does ‘pencil pusher’ mean?

What does ‘pencil pusher’ mean?
A pencil pusher means a person with a clerical job involving a lot of tedious and repetitive paperwork.
“no way he was going to let those pencil pushers from accounting pity him”
If you call someone a pencil pusher, you mean that their work consists of writing or dealing with documents, and does not seem very useful or important.
REGIONAL NOTE:  in BRIT, use pen-pusher
in British English
a person who writes a lot, esp a clerk involved with boring paperwork
the pencil pushers who decide the course of people’s lives
…the pencil pushers who decide the course of people’s lives
I was the pencil pusher, doing a lot of research.