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)
TB	Towed body	Hydrodynamic enclosures used to house transducers, hydrophones, and other electronic equipment
TD	Timing devices	Mechanical and electronic timing devices, range devices, multiplexers, electronic gates, etc.
TF	Transformers	When used as separate units
TG	Positioning devices	Tilt and/or train assemblies
TH	Telegraph apparatus	Miscellaneous telegraph items
TN	Tuning units	Receiver, transmitter, antenna, tuning units, etc.
TR	Transducers
TS	Test units	Test and measuring equipment not otherwise classified. Do not use if more specific indicators apply.
TT	Teletypewriter and facsimile apparatus	Teletype, tape, facsimile miscellaneous equipment
TU	Television	Special types
TW	Tape units	Preprogrammed with operational test and checkout data
v	vehicles	Carts, dollies, vans peculiar to electronic equipment
ZM	Impedance measuring devices	Used for measuring Q, C, L, R, or PF, etc.

Items in these tables are not always listed by an Approved Item Name (AIN), they are descriptions of general items. Refer to the H6 to find the approved names.