It means that this particular item will absorb 10 damage from each attack, as long as the weapon dealing the damage doesn't have an enchantment of +3 or higher.
It would absorb 10 damage from each attack with say a warhammer +2, but not a warhammer +3.
[QUOTE=Luis Antonio]ONLY RETARDED PEOPLE WRITE WITH CAPS ON. Good thing I press shift
[QUOTE=Luis Antonio]Bah! Bunch of lamers! Ye need the lesson of the true powergamer: Play mages, name them Koffi Annan, and only use non-intervention spells! Buwahahahahah![/QUOTE]