Board Thread:General Discussion/@comment-33618281-20180111182946/@comment-31546818-20180119002859

The Masonic Compass (that masonic symbol) is actually another dream demon seen in Weirdmageddon. His name is Kryptos and apparently Bill hates him (I guess that makes him similar to Dipper).

As for why Bill doesn't like him: https://www.reddit.com/r/gravityfalls/comments/315yoy/im_bill_cipher_i_know_lots_of_things_ask_me/cpyok75/