Armor, +1, +2, or +3 is a varies armor in D&D 5e. Known variants include Armor, +1, Armor, +2, Armor, +3. It does not require attunement.
Armor (light, medium, or heavy), rare (+1), very rare (+2), or legendary (+3)
You have a bonus to AC while wearing this armor. The bonus is determined by its rarity.