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It is a unique ID number or code assigned to a package or parcel. The tracking number is typically printed on the shipping label as a bar code that can be scanned by anyone with a bar code reader or smartphone. In the United States, some of the carriers using tracking numbers include UPS, [1] FedEx, [2] and the United States Postal Service. [3]
Tracking, combining individual radar detections with a radar tracker; Tracking system, various methods used to monitor moving persons or objects, often remotely; Tracking transmitter, a device that broadcasts a radio signal that can be detected by a directional antenna; Target and missile tracking, elements of Go-Onto-Target systems in missile ...