Armor

Armor was a form of physical protection applied to ships or structures, or worn by individuals.

Klingon uniforms typically included body armor.

Hirogen hunters wore body armor that also acted as an environmental suit. 

Some 24th century Starfleet and Borg vessels were equipped with ablative hull armor. 

By the early 25th century Starfleet possessed ablative generators which could surround a vessel in extremely resilient retractable armor.