general term for wearable technology designed to protect a person in combat. Technically the iron suits of pre astro knights are armor suits.
Modern armor suits do not only protect the individual but increase strength, agility and provide offensive capabilities, shields and computronic combat support.
Almost all space faring societies have developed armor suits. Few societies take this concept as far as the Union.
The most famous battle or armor suit remain the Quasimodos of the Union Marines.