MIL-STD-196 Joint Electronics Type Designation SystemThe purpose of this standard is to provide the policies, requirements and procedures for the preparation and submission of Requests for Nomenclature RFN under the JETDAS.

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MIL-STD-196F

Table III. Table of unit indicators. (continued)

Unit indicators	Family name	Examples of use (Not to be construed as limiting the application of the unit)
RE	Relay assembly units	Electrical, electronic, etc.
RL	Reeling machines	Mechanism for dispensing and rewinding antenna or field wire cable, etc.
RO	Recorders	Sound, graphic, tape, wire, film disc, facsimile, magnetic, mechanical, tape, and card punch, etc.
RP	Reproducers	Sound, graphic, tape, wire, film, disc, facsimile, magnetic, mechanical, punched tape and card readers, etc.
RR	Reflectors	Target, confusion, etc., except antenna reflectors (see AS)
RT	Receiver and transmitter	Radio and radar transceiver, composites of transmitter and receiver, etc.
S	Shelter	Electrical equipment, etc.
SA	Switching units	Manual, impact, motor driven, pressure operated, electronic, etc.
SB	Switchboard	Telephone, fire control, power distribution, etc.
SG	Generator, signal	Test oscillators, noise generators, etc. (see O)
SM	Simulators	Flight, aircraft, target, signal, etc.
SN	Synchronizers	Equipment to coordinate two or more functions
SS	Special purpose	Devices performing unique functions
SU	Optical units	Electro-optical units, such as night vision, scope, sights, auto- collimator, viewers, trackers, alignment equipment
SY	Speech, secure	Devices that secure voice transmission/receiving equipment
T	Transmitters	Transmitters, all types except telephone
TA	Telephone apparatus	Miscellaneous telephone equipment