This is a grayscale tileset for Nethack 3.4.3 called Cathasaigh Hack.
You can place the mouse over any tile and a tooltip will describe it.
This is not very mobile friendly. I do apologise.
A download link will be provided for your Nethacking pleasure once complete. ☯
I owe a lot of the inspiration to Roar Lauritzsen's Nethack tile fonts and the default 32x32 Nethack tiles.