German airforce:

standard number: LXY

with Y a number and X:
B = kathodebeam tube
D = sendtube (Hf)
F = ionoscope, photocel, and more
G = rectifier
K = stabiliser, ballast
M = magnetic deflection tube
S = sendtube (Lf)
V = amplification tube (Lf)

Example: LD2 is an airforce Hf send tube, LV3 is an airforce Lf amplification tube.

German army:

Standard number: RXNNYMM

number is build up with usage (X), heather voltage (NN), tube type (Y) and a number (MM), giving the amplification of pretubes and the maximum power dissipation of powertubes. And with X:
D = Hf tube
G = rectifier
L = Powertube or sendtube
K = kathode beam tube
V = receiver tube

And Y:
A = magic eye
D = full wave rectifier
G = rectifier
H = hexode
L = "laufzeit" tube
M = magnetic deflection tube
MM = double magnetic deflection tube
MS = magnetic and electric deflection tube
P = pentode
SS = double electric deflection tube
T = triode

Example: RL12T15 is 12 volt heated 15 W power triode, RV12P2000 is a 12 volt heated receiver pentode with a theoretically mu of 2000