I want to know what is the font of the "LN" and "DR" letters on this image.

Space Mono  Suggested by sjh 

Not a match, but hear me out. The 3, the N and the R match Space Mono exactly. Lop the serifs off the D in the typeface, and you match the sample. Same with the L and the 4 adding the wedge-shaped cutouts. And replace the dot with a slash, and you get the 0. I guess I'm thinking that the N and the 3 are pretty unique looking, so maybe Space Mono is the source of your sample.