What is X? Here's what to know about Twitter's new name, logo

Twitter users may have noticed a change in their mobile app this weekend.

The social media company, now known as X, changed its app icon to the new black and white X logo, officially retiring the blue bird. X debuted the new logo on its desktop version last week, and a sign reflecting the company's new name recently appeared on its San Francisco headquarters.

Elon Musk, who purchased the platform for $44 billion last year, posted about the changes earlier this month.

"And soon we shall bid adieu to the twitter brand and, gradually, all the birds," he wrote.

What is Threads?Here's how to use Instagram's new text-based app

Why has Twitter changed to X?

X is the new name of the social media company and platform formerly known as Twitter. Musk announced changes to the brand earlier this month.

Posting on the platform, X CEO Linda Yaccarino said the app will transform the "global town square."

"X is the future state of unlimited interactivity – centered in audio, video, messaging, payments/banking – creating a global marketplace for ideas, goods, services, and opportunities. Powered by AI, X will connect us all in ways we’re just beginning to imagine," she wrote.

Musk has used the letter "x" in his company branding before. SpaceX, the Tesla CEO's rocket manufacturer, uses the letter in its logo. The 52-year-old billionaire also recently launched xAI, an artificial intelligence startup.

Musk's son with singer Grimes is also nicknamed X.