Closest thing I could see was Down arrow from bar? Not sure if that is what you're after, though.

I know you can use the Unicode for it, and use Alt+X when selected to convert it into the symbol, within things like Word.

I find it in a font I use for fixed width (mostly programming) - DejaVu Sans:

0x21A7 = 8615.  However when I try to ALT+8615 the character I get something else (with that font)