The holiday commemorates a timeless symbol beloved by many in ... The length of a line drawn straight through the center of a circle and extending out to its edges is called the diameter.

Well, do you know why power buttons use a symbol that looks like a broken circle with a vertical line down the top? Here’s ...

The symbols used for inequalities are ... so an arrow below the values of 2 must be drawn in. There is a closed circle at -5 with the line showing the numbers that are greater than-5.