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From: walter@hpsadle.HP.COM (Walter Coole)
Newsgroups: comp.text.tex
Subject: Re: Creating New Math accents
Message-ID: <13590012@hpsadle.HP.COM>
Date: 16 Jul 90 23:43:02 GMT
References: <1990Jul13.024828.12875@agate.berkeley.edu>
Organization: HP Signal Analysis Division - Rohnert Park, CA
Lines: 3

How about overstriking a superscript double arrow:

$\rlap{A}^{^\leftrightarrow}$