In Quake III, the Armor Shard grants the user 5 Armor points. Armor Shards are best used to repair damaged Armor; especially powerful armor such as Heavy Armor. Armor shards are fairly common.
If an Armor Shard is picked up when the wearer already has Armor, the Armor Shard will not affect the type of armor she or he currently has.
In Quake 3, Armor Shards give out 5 Armor points. If one has no Armor when she or he picks up Armor Shards, the "new" armor will absorb ⅔ of an attack, just like the Light Armor or the Heavy Armor.