Map Legend missing icons

[burningironbutterfly]

I found a few icons on the map that dont have a explination for. Like a purple g, and yellow B. Please add more icons so I know what I am looking at. I thought the purple g meant some kind of secret.

[Mr.SeriousCatt]

Cant remember purple G but yellow B or blue A are marking the map connection from one another, it means if you cross blue A you will appear on the map on the other blue A