Stop signs are octagons so they will be very easy to recognize, even when partially obscured by vegetation, snow, etc. The stop sigh is the ONLY traffic sign that uses this shape.
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Octagons can be irregular or regular. It depends on the measure of the angles and the length of a side. An octagon is a shape with 8 sides, not necessarily the regular octagon that stop signs are shaped like.
Octagons have no perpendicular lines.
There are regular octagons, and irregular octagons.