It is often called a "Russian" cross, but it actually predates the [[Church of Russia|Christianization of Russia]] in 988 AD, although generally, the bottom bar is horizontal rather than angled. Very early depictions of the crucifixion, even those originating in [[Church of Alexandria|Egypt]], generally portray the triple bar cross.
In certain parts of Central and Eastern Europe, the triple bar cross with a slanted footrest may indicate that a given church is an Orthodox one, while a triple bar cross with a horizontal footrest indicates that a given church is a [[
Eastern Rite Catholic|Byzantine Rite]], or Greek Catholic, one.
In [http://en.wikipedia.org/wiki/Unicode Unicode], this cross is U+2626 (<font size="+3">☦</font>).