Three slashes in a row used as a binary relation in math.
U+2AFADOUBLE-LINE SLANTED GREATER-THAN OR EQUAL TOU+2AFCLARGE TRIPLE VERTICAL BAR OPERATORU+2AF9DOUBLE-LINE SLANTED LESS-THAN OR EQUAL TOU+2AFDDOUBLE SOLIDUS OPERATORU+2AF8TRIPLE NESTED GREATER-THANU+2AFEWHITE VERTICAL BARU+2AF7TRIPLE NESTED LESS-THANU+2AFFN-ARY WHITE VERTICAL BARU+2AF6TRIPLE COLON OPERATORU+2AF5TRIPLE VERTICAL BAR WITH HORIZONTAL STROKEU+2AF4TRIPLE VERTICAL BAR BINARY RELATIONU+2AF3PARALLEL WITH TILDE OPERATOR256 characters in the Supplemental Mathematical Operators Unicode block, from number 252.