It says ZIOM, but I have to admit that I struggle to see it sometimes, and it looks like there is a different word sitting along the top in blue shades, which looks like MOMM or MAMM, but I think it is just an artefact of the style of the artist. The artist is Trafficity, and his distinctive pieces are consistently well presented.
Trafficity is a member of the PAD crew, which includes Laic217 and Cort, although he tends not to paint as frequently as the others. The piece itself is composed of block letters with three discrete horizontal fills, and a little bit of extra ‘melty’ decoration along the bottom edge. Watch this space for something from my archive by Trafficity, coming soon.