Guess I'm older than dirt

Just had a discussion with another member here. He referenced:

/ty

I had absolutely no idea what that meant until he explained: "slanty." I.e., slant six.

Does everyone else know what /ty means? Or am I the only clueless old fart here?

Oh well, at least I can tell time on an old-fashioned clock with minute and hour hands (my grandson can't). I also know how to use a dial phone. Plus I can write cursive. And drive a stick shift. Etc., etc. . . .
I have not seen the “/ty” moniker before.