striation
One of a group of usually parallel scratches engraved in bedrock by a glacier or other geological agent.
A glacier must have come through here, look at these striations.
glacial striations
Marks that appear from rug burns or clothing burns after dry humping or grinding.
After 2 hours of dry humping him I had all these glacial striations.
Muscle Striations
One of a group of usually parallel scratches engraved in muscles by a barbell or other exercise agent.
The muscle striations started to form in his shoulders when his body fat percentage was reduced