Unnamed Suit

Unidentified Artificial Mechanism 1 is an unnamed suit upgrade. In Metroid Fusion, Samus was infected with by X Parasites and much of her Power Suit was surgically removed. She was given a vaccine made from the DNA of the Baby to save her life. Toward the end of the game, she defeated the SA-X, a sentient X born from the infected suit parts, but its Core-X escaped before she could absorb it. It later intervened when Samus was battling - and losing to - an Omega Metroid, and she was able to absorb it, granting her Fusion Suit an upgrade beyond even the previously-absorbed Varia Suit and Gravity Suit data. As with the previous suit upgrades, the Fusion Suit’s color scheme changed (this time to orange-on-yellow, resembling her destroyed Varia Suit prior to infection) and she became far more resistant to damage. She also regained the ability to use the Ice Beam (which Adam had previously conjectured would be rejected by her altered cellular makeup, due to a cold vulnerability from the Metroid DNA inside her) as a result of literally absorbing herself, prior to the infection, surgery, and vaccine.

In Metroid Prime, with the Fusion Suit mode turned on, the Phazon Suit is represented by this color scheme. Strangely, however it has a blue visor instead of the actual green.

This might be a version of the Fusion suit, with the classic orange scheme instead of the blue scheme.

Interview
"In Metroid Fusion, it seems to have established that "Samus can't use the Ice Beam because she has inherited the nature of the Metroids", but why at the very end is she unconcerned when she regains the Ice Beam?"

Yoshio Sakamoto: "When she absorbed the core of the SA-X (the perfect condition of Samus), she basically reconstituted her genetic condition. She didn't recover the physical damage of her amputated suit, but she did recover her genetic condition."