Unicode has a lot of characters that look like English letters. For example it has โ, the standard symbol for the set of real numbers. All together they form alphabets.
They're included in unicode for whatever reason [1]. It'll work in everything that handles unicode properly and has a font that includes those characters.
In the early 2000s, unicode added a block of Mathematical Alphanumeric Symbols. The styles stay constant because ๐, โฏ, and ๐ฎ might mean different things.