He was clean-shaven, except for those frustrated whiskers once sacred to stage butlers, but latterly adopted as the Sigil of the New Bohemia.
"The Orchard of Tears"
Sax Rohmer
Swinging it aside and revealing the safe behind it, he used his identity-Sigil, took out a wad of Paratemporal Exchange Bank notes and gave them to the girl.
"Time Crime"
H. Beam Piper
Even a human soul we do not recognise unless we see it in a body-parents provide the outline, the signature, the Sigil of the returning soul.
"Four Weird Tales"
Algernon Blackwood