An orange diamond is the symbol on a regulatory marker that indicates hazards such as rocks or stumps.
A felt marker is simply called a marker or felt marker.
keep out of that area
red and yellow
re
This is a non-lateral marker. It can indicate a controlled area, such as no wake. It can be an informational marker, a "keep out" marker, or a warning marker (Dam, Rock, etc)
keep out of that area
it spoils and rots and gets moldy
A control marker or control
Hazard
Blue and Orange
Controlled area