(known as Mech Gouki
in Japan) is a powered-up and mechanically-enhanced version of Akuma
engineered by Apocalypse.
Cyber Akuma can perform most of Shin
Akuma's moves and also has some attacks which involve launching his mechanical left arm.
Also worth noting is that Cyber Akuma's mechanical left arm is very similar to
the design of Zero Akuma's arms
(a giant mech from Cyberbots, also based on Akuma).