---
title: "Sigma Icon | Free Download PNG & SVG | Plump Neon"
product: "Streamline Icons, Illustrations and Elements"
url: /icons/download/sigma--30972
canonical_url: "https://www.streamlinehq.com/icons/download/sigma--30972"
summary: "Rounded neon icon of a Greek sigma symbol. Used for summation, mathematics, and formulas."
---

# Sigma icon

The Sigma icon shows an outlined Greek sigma character with broad curves and angled inner joins. Drawn in the Plump Neon style on a 48px grid with a 3px stroke for bold, clear recognition. Use it for summation notation, mathematical formulas, statistics tools, and equation editors. It belongs to Plump Neon set in the Plump family.

## Preview

![Rounded neon icon of a Greek sigma symbol. Used for summation, mathematics, and formulas.](https://assets.streamlinehq.com/image/private/w_240,h_240,ar_1/f_auto/v1/icons/plump-neon-style/interface-essential/text-formatting/sigma-xts6th3q25ygfgljuhmyp.png?_a=DATAiZkSZAA0)

## Details

- **Name**: Sigma
- **Type**: Icon
- **Set**: [Plump Neon](/icons/plump-neon-style.md) — Plump is highly inspired by cartoons. With its warm appearance, this set of chunky icons is a natural choice for friendly brands. The Neon style is especially effective in complex environments where quick recognition and hierarchy are essential. It also allows you to customize the line thickness. All Plump Neon icons are designed on a 48px grid with a 3px default stroke and two customizable line colors.
- **Family**: [Plump](/icons/plump.md) — Friendly icons
- **Style**: Neon, Stroke
- **Category**: Interface Essential › Text Formatting
- **Default size**: 48px
- **Stroke width**: 3px
- **Pricing**: Pro
- **License**: [Commercial](https://home.streamlinehq.com/license-premium)
- **Author**: [Streamline](https://home.streamlinehq.com/)
- **Formats**: PNG, WEBP, PDF, SVG, JSX
- **Tags**: Sigma, sigma, Summation, sum, math, symbol, statistics, Greek, letter, formula, algebra, uppercase, formatting, format, text

## Download

- [Download Sigma on Streamline](https://www.streamlinehq.com/icons/download/sigma--30972)

## Also available in other styles

- [Sigma — Plump Flat](/icons/download/sigma--26101.md) (Pro)
- [Sigma — Plump Solid](/icons/download/sigma--25966.md) (Pro)
- [Sigma — Plump Pop](/icons/download/sigma--31857.md) (Pro)
- [Sigma — Plump Duo](/icons/download/sigma--25895.md) (Pro)
- [Sigma — Plump Line](/icons/download/sigma--25585.md) (Pro)
- [Sigma — Plump Gradient](/icons/download/sigma--29834.md) (Pro)
- [Sigma — Plump Remix](/icons/download/sigma--30184.md) (Pro)

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