This image appears in the FAA Test Supplement Commercial Test FAA-CT-8080-1E but I am unable to find it in the AIM or the Pilot’s Handbook of Aeronautical Knowledge. I looks like a don’t taxi here pavement marking, but I’d like confirmation of my guess.
The closest I can get to an official explanation is in the AIM 2-3-2 b
Markings for taxiways, areas not intended for use by aircraft (closed and hazardous areas), and holding positions (even if they are on a runway) are yellow.
But the examples don’t match this graphic.