M-number correction unit

fuse calibration correction / fuze calibration correction

battery coolant unit / battery-coolant unit (BCU)

gear reduction unit / gear-reduction unit

position and navigation unit / position navigation unit (PNU)

code number

despatch number

equipment component number (ECN)

lay reference number

lot number

Mach / Mach number

national stock number

NATO stock number (NSN)

reference number (order / message / report)

registration / identification number

series number

service number

sheet name / number

target number

main gun (cannon) number

NSN / NATO Stock Number

task identification number (ID)

rammer number

ballistic group number

breech number

cetane number in border line

chemical octane number

flight Mach number

acid number

base number

bromine number

cetane number

iodine number