Octagon black outline icon
Octagon outline with a second smaller octagon nested inside it
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About the Octagon black outline 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 black outline version of the octagon icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
Download it free as a scalable SVG vector or transparent-background PNG in seven sizes (16 to 512px), copy the SVG code straight into your project, or open it in the free online editor to change colors, apply gold, silver, neon and gradient styles, animate it, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
