Hello @ghostsinoureyes, I don’t personally know what the sigil is used for, but I managed to get some information from Straight to Hell. I hope it helps you!
sigils
We are not children of celestial fuckin’ light, walkin’ arm-in-arm into the Age of Aquarius. We are wankers who wreck the planet an’ piss on each other, ‘til half the world’s starvin’ an’ the other half’s busy findin’ new ways to keep from noticin’ it. That’s the fuckin’ limit’ve our potential, believe me.
I wonder what issue/comic this picture is from, and why Constantine’s drawn what I think is Vegvisir on the table.
What I believe is Vegvisir, the Runic Compass, on the table. (Second Pentacle of the Sun)
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Update #1 from graycloak:
John Constantine's Spells 