I've no idea what vertical bar with a small hook to the bottom right means. It's certainly not a common math symbol. (At least, not on its own. It's a "left floor" symbol, usually used together with a "right floor" symbol, indicating the expression in between is rounded down to the nearest integer).
It's a symbol that doesn't display well in my urxvt.
And even if it did, it will be awkward to enter in my editor.