0101

 "01000100 01101001 01100101 00100000 01101101 

01110101 01110100 01100001 01101110 01110100 00101110" ~ 0101 (translates to "Die Mutant")

0101 is the code-name of an advanced Sentinel that appeared as a villain in X-Men Gold - unlike most other Sentinels before it this model was nanite-based and thus one of the more deadlier variants of the mutant-killing machines to encounter mainstream Earth.

Abilities

 * Nanite Physiology (0101 has a nanite-based physical structure, which allows a host of superhuman abilities such as shape-shifting, dispersion and splitting itself apart at will)
 * Adaptive A.I. (0101 is highly adaptive, being a Sentinel, it learns quickly and evolves in response to threats or obstacles)

Trivia

 * 0101 speaks entirely in binary.
 * 0101 is never named in the actual issue it appears.
 * it is one of most advanced Sentinels currently faced by the X-Men (a title which it shares with Nimrod, Master Mold and Bastion)