Twemoji is an open source emoji project, created and owned by Twitter. Emoji designs from Twemoji can be found on the Twitter.com website, TweetDeck and Twitter for Android. The native Twitter app for iOS uses native emojis as provided by Apple and as such does not use Twemoji.
Due to the open-source nature of this emoji set, non-Twitter apps such as Discord use Twemoji for emoji display.
In addition to standard emojis, custom Twitter emojis (sometimes known as Hashflags) are enabled for some events and promotions, which are not part of the Unicode Standard. These only display on Twitter for a limited time, and are often linked to promotional campaigns.
Emojis from Twitter Twemoji 11.2 are displayed below.