Σ Chip

The Σ Chip (Sigma Chip) is a creation of Enemice-HL, containing Sigma's data. It is used by Enemice to transform into a copy of Sigma in Rockman X Mega Mission 3.

Characteristics
The chip has an octogonal format with purple, rectangular edges on the sides. The chip has Sigma's symbol in it, making it easily recognizable. The chip contains a copy of Sigma's personality that takes over the Reploid who installs it.

Rockman X Mega Mission 3: VS Hyper Limited
Enemice reveals the Sigma Chip in his possession when he is cornered by the combined efforts of X, Zero, and Return X (who had transformed himself into armor for the duo). He attempts to use it as his trump card, planning to obtain Sigma's destructive power; however, Enemice's mind is erased and taken over by Sigma's, creating Sigma Limited.