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The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM , UMTS , LTE , 5G NR , iDEN , Iridium or other IMEI-employing wireless ...
IATA aircraft type designators are trigram letter/digit codes used for aircraft models, like "J41" (British Aerospace Jetstream 41) and "744" (Boeing 747-400). Country codes. Digram letter codes are used for countries as specified in ISO 3166-1 alpha-2. One additional code is used: