1) Arm armor 2) Arm badge 3) Armor plate 4) Armor plating 5) Armour plate 6) Military insignium 7) Plate armor 8) Plate armour 9) Uniform armband 10) Upper arm band 11) Western plate armour 1) Armband 
A brassard or armlet (British English) is an armband or piece of cloth or other material worn around the upper arm, the term typically restricted to use as an item of uniform worn as military uniform or by police or other uniformed persons. Unit, role or rank badges or other insignia are carried on it instead of being stitched into the actual clot...
badge worn on the arm; piece of armour for the arm
[n] - armor plate that protects the arm
noun armor plate that protects the arm
a decorative cloth band, often braided or tasseled, worn around the upper arm, as by military personnel to signify a particular group, regiment, etc. · a piece of plate armor for the arm.