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It looks like an upside-down "T".
a circle has no corners or sides and a triangle has 3 of each.
None and no diagonals
The letter T. The "square" in the name refers to the right angles formed where the horizontal of the T meets the top of the vertical.
36 = 62 = Triangle(8) The triangle number formula: T(n) = (n2+n)/2. Here is T(8) graphically: . 1 = T(1) = 1 .. +2 = T(2) = 3 ... +3 = T(3) = 6 .... +4 = 10 ..... +5 = 15 ...... +6 = 21 ....... +7 = 28 ........ +8 = 36 36 = 62, graphically: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .