A straight line

"That which lies evenly between its extreme points." Euclid. "The shortest line between two points." Chauvenet. "A line which has the same direction through its whole length." Newcomb.
- Euclid.

See also: Straight

References in classic literature ?
But now, drawing back to the edge of the table, gradually lower your eye (thus bringing yourself more and more into the condition of the inhabitants of Flatland), and you will find the penny becoming more and more oval to your view, and at last when you have placed your eye exactly on the edge of the table (so that you are, as it were, actually a Flatlander) the penny will then have ceased to appear oval at all, and will have become, so far as you can see, a straight line.
As soon as you look at it with your eye on the edge on the table, you will find that it ceases to appear to you a figure, and that it becomes in appearance a straight line.
If our friend comes closer to us we see his line becomes larger; if he leaves us it becomes smaller: but still he looks like a straight line; be he a Triangle, Square, Pentagon, Hexagon, Circle, what you will -- a straight Line he looks and nothing else.
One player is designated as the "rabbit" and has three or four "chasers" facing him in a straight line.
Assume that three players are in a straight line - A at the back of the line and C near the goal.
Major point: Never station three players in a straight line - either up, across, or on a diagonal.