Sigma black outline icon
Uppercase Greek letter sigma, the summation symbol, in outline stroke
About the Sigma black outline icon
The capital Greek letter sigma, the mathematical summation sign, formed by two arms meeting at a sharp central point with a straight top bar and bottom bar that turn down at flat ends. Because sigma is the universal shorthand for a total, it fits spreadsheet and calculator toolbars, statistics dashboards, formula editors, sum buttons in data tables, math courseware and engineering documentation.
The stroke is uniform and open rather than filled, with the two arms nearly equal in length so the letter stays optically centered in a square frame. It sits naturally beside pi, delta, infinity and equals icons in a mathematics set. Align it to the same baseline as your numeral glyphs so a sum button reads as part of the type, not an image.
This is the black outline version of the sigma icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
Get it free as an SVG vector or transparent PNG (16-512px), copy the SVG code, or restyle it in the free online editor — recolor any part, add gold, neon or gradient effects, animate it, or export EPS, PDF and DXF.
Free for personal and commercial use with attribution.
