Not sure what equipment these were used in, but X, Y, Z for a digital readout on a CNC machine M, G, T are SI prefixes S, F, N, H are units It’s also likely

Not sure what equipment these were used in, but X, Y, Z for a digital readout on a CNC machine M, G, T are SI prefixes S, F, N, H are units It’s also likely that they have meanings in German or another language I’m not familiar with. Large tubes like these have been used in elevators, so they could be floor designations.