Figured out what the deathly hallows are.

Four hallows of Arthurian legend- Sword or dagger, chalice of cup, baton or wand and coin, disc or pentacle.

Based on four treasures of Ireland, pops up in all sorts of legends, still seen today as the cup, wand, sword and pentacle of tarot.

The regalia of a king represents these objects. Sword, septre, crown, orb. Voldemort was making himself king by choosing these artifacts to become hurcruxes.

So they are the remaining hurcruxes. Harry knows he's looking for an artifact of each founder. Hufflepuff's cup, Slytherin's locket, Ravenclaw's wand, "something of Griffindor's". That something is the sword sitting in Dumbledore's office.


SO, the "Deathly Hallows" are the 4 remaining Horcruxes. Hallows beause they are these four items, Deathly because they are hurcruxes. Hallows could also refer to the founders themselves.