I was reading Volo's Guide to Monsters and came across the *Bodak*. The book says:

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> A worshipper of Orcus can take ritual vows while carving the demon lord's symbol on its chest over the heart...
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I've found Orcus' stat block in (potential spoilers?) 

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>  Out of the Abyss
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but no symbol related to him. I'd like to do some story stuff with the symbol. Where can I find official material on Orcus' symbol? Past editions are welcome if consistent, but a 5e-specific answer is preferred since I only have 5e material. In the absence of 5e material, I will take what I can get.