Many linguists stated that circa is a Latin word, which means around or about. In English, circa  appears as something like or approximately. However, this can be inconvenient because it seems too long in tables and other contexts.
Source: https://fbsymbols.net/circa-symbols/

The username should consist of at least six-character.
Use the combination of letters, numbers, and special characters.
Only dot ( .), dash ( -), or underscore (-) special characters are allowed in the username.
Don’t use any consecutive symbols to create the username.
Username can’t begin with or end with a symbol.

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