I suppose you could call these brutalist lighting. Or more simply, they could be described as concrete letter lamps by Seletti.
Take your pick from all the letters of the alphabet. Or alternatively, but a few and make a word if you have the budget. All feature neon lettering within a concrete casing and all are good for indoor or outdoor use, as well as freestanding or fixed to a wall.
You will need a transformer (which is sold separately), with the lamps on their own coming in at £95 each.