The NeXTSTEP tiles is a recreation of a tileset used on a NeXTSTEP system. This tileset can be used with NetHack 3.4.3. The tiles are 10x10 pixels in size.
The NeXTSTEP NetHack used one image per monster symbol, so eg. all ants get one image, all blobs get another, and so on. The images have parts which are colored on the fly to make the distinction between different tiles.
The newest version of NetHack for NeXTSTEP is v3.0i, so some new tiles had to be drawn from scratch.
The original graphical NeXT port was done by Christoph Marquardt, and this new tileset was recreated from those tiles by User:Paxed.