https://www.bleepingcomputer.com/news/technology/why-certain-characters-glitch-gmail-youtube-and-twitter/

Have you ever used Twitter, Gmail, or YouTube and noticed odd characters being displayed vertically overlay other text on the page or break out UI boundaries? If so and have wondered how this is happening, we dive into the wonderful world of Unicode that causes this behavior.

For the past few days, viewing Bleeping Computer's Twitter profile page has started to look glitchy, with characters shooting up from another user's display name. These strange characters made the Twitter profile page hard to ignore, and I just had to write about it.