Your question is very unspecific, however, I'm going to say a bookmark. A book marker is a bookmark!
Or it could be a highlighter, that is a book marker.
Again your question is quite unspecific.
A felt marker is simply called a marker or felt marker.
A control marker or control
walmart
Phrase
Because it never washes or rubs off.
what is it called when a sea bird lands on a channel marker? Bouy meets gull.
The direction marker on a map called a compass rose. It was so named because the directional lines drawn from the marker were said to resemble a rose.
A paintball marker is a paintball gun. It is just called a marker instead of a gun.
Pylon
Rubbing alcohol
The Book of Jer3miah - 2009 Mile Marker 3 1-11 was released on: USA: 3 April 2009
low bridge marker