Octagon black filled icon
Octagon outline with a second smaller octagon nested inside it
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About the Octagon black filled icon
An eight-sided polygon drawn twice, one octagon set inside the other so a narrow border runs around the whole shape. The regular sides and cut corners read as a stop-sign silhouette and as a basic geometry primitive. Use it in maths and geometry lessons, shape libraries, diagram and flowchart builders, badge or seal layouts, and traffic-sign illustrations.
Both octagons are regular, with equal sides and matching corner angles, and the inner one is inset evenly so the ring stays the same width all round. It sits naturally beside hexagon, pentagon and heptagon shapes in the library. Keep the stroke thin at small sizes so the double edge does not merge.
This is the solid black filled version of the octagon icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
It downloads free as an SVG vector or transparent PNG in seven sizes, and the free online editor lets you recolor it, apply gold, silver, neon and gradient styles, add animation, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
