The caret is a standard character in most fonts, but you’d need to turn it upside down using CSS for your purposes. Carets are typically narrower than what you’ve shown, though, and don’t align with the x-height. The same is true with circumflexes, which are similar in shape and in most any good font, but are used at cap height or higher as accent marks.
I didn’t check out the font RKK pointed to, so it might work. Here’s a link to a free symbol font with the glyph you’re looking for ( [Stroke 7 font ). Looks like it’s even available in WOFF file for use on the web.