target reference number

lay reference number

reference number (order / message / report)

attitude-and-heading reference system / attitude and heading reference system (AHRS)

target number

target reference point (TRP)

reference target

target scattering crossover / target scattering cross-section / electronic target profile

code number

despatch number

equipment component number (ECN)

grid reference box

grid reference system

guidance reference system

gyroscopic reference unit (GRU)

lot number

Mach / Mach number

map reference

map reference code

military grid reference system (MGRS)

national stock number

NATO Master Cross Reference List (NMCRL) (logistics)

NATO stock number (NSN)

numbered reference position system

reference

reference diversion point

reference data

registration / identification number

series number

service number

sheet name / number

stabilization reference package (SRP)

terms of reference (TOR)