Until 2010 or so, the Unicode glyph U+221A corresponding to the square-root sign (the HTML entity is named "radic" and has decimal code 8730) was usually rendered with a short built-in vinculum. That made it an inadequate graphical replacement for the original character from the Symbol font (itself designed around a slanted line extending all the way to the upper-right corner of the character box, without any spacing). The more recent renditions of the HTML "radic" entity (U+221A) no longer feature any vinculum and are thus more compatible with the standard graphical representation introduced in the Symbol font. Both styles of the square-root glyph (with or without a short vinculum) have the same disembodied "meaning", so the integrity of the Unicode repertoire is not compromised by this adjustment.