The word "refresher" means something that is used to help you remember or renew your knowledge or skills on a particular topic or subject. It is like a quick review or reminder to help you remember things you already learned. Full definition
She invites manufacturer representatives to teach the staff about new products, and she often asks reps to come back for refresher courses on products the store has had in stock for awhile. (petbusiness.com)
On Page 4 of his piece, he does a quick refresher on how we got to where we are. (writerunboxed.com)
This training will be repeated as new teachers and leaders come into our schools, and as individual teachers and principals ask for refresher or enhancement courses. (education-consumers.org)