---
title: "Sigma Icon | Free Download PNG & SVG | Flex Line - Free"
product: "Streamline Icons, Illustrations and Elements"
url: /icons/download/sigma--26801
canonical_url: "https://www.streamlinehq.com/icons/download/sigma--26801"
summary: "Clean line icon of a Greek capital sigma. Used for math, summation, formulas, and symbols."
---

# Sigma icon

The Sigma icon shows a Greek capital sigma drawn as a single angular, continuous form. Drawn in the line style on a 14px grid with a 1px stroke so its rounded curves stay clear at small sizes. Use it for mathematical notation, summation controls, formulas, educational tools, and symbols. It belongs to Flex Line - Free set in the Flex family.

## Preview

![Clean line icon of a Greek capital sigma. Used for math, summation, formulas, and symbols.](https://assets.streamlinehq.com/image/private/w_300,h_300,ar_1/f_auto/v1/icons/interface-essential/sigma-ndpn8ub35cf61b53e7q66.png/sigma-c8wbskuc4ti9ounmbmvih5.png?_a=DATAiZkSZAA0)

## Details

- **Name**: Sigma
- **Type**: Icon
- **Set**: [Flex Line - Free](/icons/flex-line-free.md) — [Free + Open-source] Flex is a fluid icon family inspired by nature's curves. The Free Line variant features elegant strokes with organic curves. Licensed under the Creative Commons - CC BY 4.0
- **Family**: [Flex](/icons/flex.md) — Fluid icons
- **Style**: Line
- **Category**: Interface Essential › Interface Essential
- **Default size**: 14px
- **Stroke width**: 1px
- **Pricing**: Free
- **License**: [Free](https://home.streamlinehq.com/license-free)
- **Author**: [Streamline](https://home.streamlinehq.com/)
- **Formats**: PNG, WEBP, PDF, SVG, JSX
- **Tags**: sigma, sum, formula, text, format, formatting, symbol, lineart, outline, shape, waveform, zigzagline, zigzag, jagged, sharp, electricity

## Download

- [Download Sigma on Streamline](https://www.streamlinehq.com/icons/download/sigma--26801)

## Also available in other styles

- [Sigma — Flex Duo - Free](/icons/download/sigma--26837.md) (Free)
- [Sigma — Flex Flat - Free](/icons/download/sigma--26854.md) (Free)
- [Sigma — Flex Neon - Free](/icons/download/sigma--31955.md) (Free)
- [Sigma — Flex Gradient - Free](/icons/download/sigma--29611.md) (Free)
- [Sigma — Flex Remix - Free](/icons/download/sigma--29613.md) (Free)
- [Sigma — Flex Pop - Free](/icons/download/sigma--31939.md) (Free)
- [Sigma — Flex Solid - Free](/icons/download/sigma--26818.md) (Free)

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