There are some words that may get your posts buried by the new Twitter algorithm. This is a simple tool to use unicode lookalikes to obfuscate those words from filtering…
Please keep in mind that obfuscating words in this way can have a negative impact on accessibility, so try to keep it to a minimum.
Not sure if it's working? Paste whatever you copied into a Unicode inspector to check it out. You'll see some standard Latin characters in there for things that don't have a lookalike, but you'll also find all sorts of other characters.