The Sigil of the Gate is found on the cover of most copies of the Necronimicon.
"Yog-Sothoth knows the gate. Yog-Sothoth is the gate. Yog-Sothoth is the key and guardian of the gate. Past, present, future, all are one in Yog-Sothoth. He knows where the Old Ones broke through of old, and where They shall break through again. He knows where They have trod earth's fields, and where They still tread them, and why no one can behold Them as They tread."
- H.P. Lovecraft, The Dunwich Horror
Both Presupported and Non Supported Versions Included