How can a triangle ruler be a set 'square'? That makes no sense!
It makes perfect sense; the function is in the name: a set square is used to set things square, ie at right angles. "Square" has more than one meaning, you see. Are we square now, you square, or are you eating a square meal in the town square? (Be careful nothing hits you square in the face!)
I hadn't seen these last few posts. My other half stumbled across these figures in Poundland today and picked up a full set for me. At that price, I went along after work and picked up 2/3 of a set to keep carded - I shall keep my eyes peeled for the other two. I hadn't come across these before, nor the licensee, a Hong Kong company named Prexio.