Not to spam but just to add. WoW used A LOT of Warcraft 3 icons up until Cataclysm where they started if I recall correctly replacing some of the old Warcraft 3 icons with new icons.
If you were to play Classic WoW you’d spot many icons from Warcraft 3.
The use of the Heroes of the Storm, Divine Shield icon is usual. It has extra functionality to WoW and WC3. In both those games it makes the Paladin invulnerable to damage and crowd control. In Heroes of the Storm it functions much the same way, BUT also gives movement speed and Uther can cast it on allied Heroes, to save them from deadly situation.