Comments from the [prime page for (steel square)](steel - prime details | uchisen - Learn Japanese Visually square) - Join the discussion by posting a comment!
∟ - steel squareIf you don’t know what a steel square is, don’t worry, because I didn’t know either. It’s the name of the tool used by carpenters to measure in two directions at once. This prime resembles the shape of one. This is an original prime.