...you should know what this means as part of your PPL training
Well, after my PPL training I sort of gathered that the funny symbol meant people might be flying in on it, but how high? How far out? It was only when I got my IMC that I realised that people might be flying OUTBOUND on a nearby track too.
Maybe this needs rectifying in the PPL syllabus, and it's worth mentioning from time to time in GASIL, Safety Sense etc. But the fact remains, there will be planes out there not squawking, not talking to the tower and not really looking. Anyone flying an approach in Class G in VMC must treat it as bandit country, just like any other Class G. "It was the other guy's fault" is a great epitaph.