https://lgbtqia.fandom.com/wiki/Sapphic had never heard achillean either. I'm glad I did tho, it helped clear up an apparent inconsistency with the term lesbian. Neat!
I'm mostly straight & cis, but I know Hexbear has a large queer presence (I love my trans comrades!) so it's actually surprising to have not encountered it much here. I guess that's what I get for staying out of /c/anti_cishet_aktion like I'm told lmao.
Relatedly, I'm always surprised at how few people know the word Yonic. Phallic I feel is pretty well known and widely used, but it seems like Yonic isn't well known. (just and phallic means looks-like-a-penis, yonic is looks-like-a-vagina/labia)
Yonic is from Sanskrit and was first recorded as used in English in the 19th century and Phallic is from Latin and has thus been around in the west far longer. So it makes sense that Phallic would be used more in English.
Also because society is obsessed with dicks.