Marker boards are surfaces that can be written on with markers, usually used for presentations or to write down ideas and information that can be easily erased or wiped off. Full definition
Ideally, the room contains a large table for participants to write on during the session and a white / marker board for the group leader to use to present material. (cebc4cw.org)
The player races against the clock with each stage being broken down into sections by red marker boards visible along the road side as you race. (ab-gaming.com)