@secretasianman whoa where's this!
looks like that's ⫡, and last row fourth from the left there's also a right angle with S that I don't think is in Unicode. but there is ⦞
I've kind of also wondered what that S means too, maybe it's like "solid angle" or smth, but that doesn't explain the perpendicular with S

@secretasianman wait there's a parallelogram with an S too (sixth row eighth from right) omg what does the S mean lol

@secretasianman there's also an S in a square and S next to two lines??? WHAT does the S mean