Hollow white vertical bar, known as the Dijkstra choice operator in computing.
U+2AFDDOUBLE SOLIDUS OPERATORU+2AFFN-ARY WHITE VERTICAL BARU+2AFCLARGE TRIPLE VERTICAL BAR OPERATORU+2AFBTRIPLE SOLIDUS BINARY RELATIONU+2AFADOUBLE-LINE SLANTED GREATER-THAN OR EQUAL TOU+2AF9DOUBLE-LINE SLANTED LESS-THAN OR EQUAL TOU+2AF8TRIPLE NESTED GREATER-THANU+2AF7TRIPLE NESTED LESS-THANU+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 255.