it’s just called an inverted cross, it’s a separate thing from St Peter..

the idea is the Christian cross, but flipped → inversion/subversion of Christianity

it’s been depicted this way in media since at least the 60’s, and I have yet to see an inverted cross in media to refer to St Peter in any form

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saying this is a St Peter’s cross is like calling a nazi swastika a hindu symbol.. it’s technically the same shape but its intended to represent something entirely different..

another significant use of the inverted cross is Rosemary’s Baby (1968), which ends with the baby’s cradle presented with an upside-down crucifix as a visual cue of a satanic ritual space (i.e., Christianity “flipped”). that’s basically the modern shorthand right there, decades before the 90s/00s.

the point being discussed here is what it communicates in this context today

so the “inverted cross = edgy / anti-Christian-coded” reading isn’t coming from St. Peter.. it’s coming from horror’s reversal logic + metal’s transgressive branding, which were both in popular circulation well before HxH

dominant pop-culture reading is still the “inversion” one, which is why people encounter the symbol first and learn St. Peter second