A queue
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it is called a cue
horizontal line
A location on a line is often called a point, or a place on the line.
The line that crosses the y-axis is called the intercept.
The line from the center of a circle to the edge is called a radius. The radius can be used in pi and a lot of other things. If you use the radius the wrong way, your answer will be wrong. Most people call it the " line from the center of a circle to the edge of a circle " but it's called the radius.