Screenshot of view source of Bill Clinton's twitter page. Symbol shows as  which is a unicode format special symbol.
When I first saw it here, this reminded me of special characters included for drawing boxes that were available in an extended ASCII character range on DOS computers (special symbols that filled out the 8-bit range up to 255, going above the range used for normal letters, numbers, and punctuation.) One of those symbols looks the same to me. Extended ascii 192. Included here out of curiosity. But I'd take the unicode as more meaningful.
https://theasciicode.com.ar/