A kickstarter some may find useful - Hermetica - A Library of Occult Symbols
I came across this and thought many mapmakers might find this useful.
https://www.kickstarter.com/projects/1319054093/hermetica-a-library-of-occult-symbols-for-designer
Darkechilde
https://www.kickstarter.com/projects/1319054093/hermetica-a-library-of-occult-symbols-for-designer
Darkechilde
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https://www.kickstarter.com/projects/justinmason/the-big-book-of-maps-volume-2-science-fiction/description
Picked up commercial license for all the symbols he makes from this and his first kickstarter. About 1000 symbols all up apparently.