One of the things I DO see in Antifa symbology is a red triangle pointing down, next to a black triangle pointing up... That's 'as above, so below' symbology with occult origins, which is why I noticed it.
Doesn't make it so, but I can see where people could put two and two together...
I haven't found that. Could you give a link?
This is what Snopes says
snopes states:
The ADL disputed that the red triangle was commonly used as an antifa symbol.
It's certainly not a commonly used antifa symbol (a time-restricted google search - for before the Trump scandal - returns almost no results.) and thus not an obvious choice for an attack ad on antifa - like the red and black flag or three arrows would be.
There are some occasional antifacist groups (when using a broad definition of antifa) which do use the symbol, such as the Union of Persecutees of the Nazi Regime*, but it is always a reference to the Nazi symbol which was used to mark political prisoners and because of that is a poor choice for usage in an attack ad.
I did see an Antifa symbol with an A in the middle of a circle. The top of the A was red and the bottom was black. It was a red and black flag. But the A wasn't inverted so the Triangle wasn't either.