What is Twitter's open-source emoji graphics set called?

Twitter’s open-source emoji graphics set is called Twemoji. The name combines “Twitter” and “emoji,” and the project provides reusable emoji artwork along with tools for displaying those graphics on the web.

Twitter released Twemoji so developers and websites could use a consistent visual style rather than depending entirely on the operating system’s emoji font. The project’s artwork is distributed under a Creative Commons CC-BY 4.0 license, while its JavaScript library uses the MIT license. This separation reflects the difference between the graphic assets and the software that handles them.

Twemoji is not the same as Noto Emoji, OpenMoji, or JoyPixels. Those are separate emoji projects with their own designs, histories, and licensing arrangements. Twemoji graphics have also appeared outside Twitter, including in software projects and browser-related implementations.

One subtle point often gets missed: emoji text and emoji artwork are not identical. A Unicode character such as U+1F602 supplies the encoded symbol, but a platform chooses how to draw it. Twemoji is Twitter’s design layer for those standardized characters, not a replacement for Unicode itself.