Hold the Alt key and type the ASCII code of the character you want to get. To type the hexadecimal string of a character or symbol for your Content Warning face, however, you need to tinker with ...

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HEXDC: HEX Dollar Coin is the stablecoin that may be issued from a user's collateralized debt position and freely transferred/traded to any wallet address. Intended to maintain parity with the US ...

But fortunately the ASCII code table has at least 128 "unused" entries between 0x80 and 0xFF, normally used for the local codepage. But with setCharacterMapping(<ASCII_value>, <UTF16_value>) you can ...