Teagen Sirrus
The only way some of these people would even know it was used in Alchemy is from watching anime. It was used long before that, and it needs to be recconized for what it really is, not for what some cartoons show it to be.
As a past explorer of Alchemy and it's opposing, Necromancy, I would be one who could care less where people know it from. Atleast FMA actually got some of the formulas and equations correct. Yeah, that's right, I know what 'Cartoon' you speak of, but I did not explore alchemy or learn alchemy for or from that.
We know who really does know their alchemy and who doesn't, and I suspect that you wouldn't know that much because you recently thought that this was offensive in thinking that it was an inverse pentagram.
Those who really expect to participate in it are the only ones who ACTUALLY need to know what it really is.
Others can sit down and watch their anime and pretend.