Abbreviation for Diameter(as used in Technical drawings).
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This is an equals sign with a diagonal line through it ≠ .
No. The diagonal through a rectangle can be computed via the Pythagorean theorem: c2 = a2 + b2 where c is the diagonal length and a and b are the horizontal and vertical lengths of the rectangle.
七 [qī] It is a line going up to down, then a line going across to your right, then a little line up. Now start on your right side and draw a diagonal line in the middle of the line going down.
A circle with a straight line through it, usually at an angle, and often with a small dot where the centre of the circle would be (also on the line, to clarify that the line does go through the centre).
An equals sign with a diagonal line through it.