M-25a power armor is a suit of body-assisting power armor designed and built in the War of Freedom by Matauan army engineers. Model 25a power armor is the first generation issue of the Matauan and Scetanian militaries, a product of years of engineering and experimentation on nuclear power, alloys, composite materials, bullet-resistance, and other assets of the armor.
The system of designation used for this suit of power armor, and other generations is the Matau system. Model is abbreviated to 'M', the step of development number is after the M and the type of suit is put next to the step of development number as a lowercase letter. In turn, this is Model #25 assisted power armor.