Serial number
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A serial number is a unique identifier used to uniquely identify an item, and is usually assigned incrementally or sequentially.
Traveller's cheques, a kind of insured cash money in form of a paper cheque, are sold to customers in sets having consecutive numbers - one of the very few type of items where consumers have access to "serialized" similar things.
Serial number on a Ballester–Molina semi-automatic pistol
Serial number of a laptop computer
The RAF serial (XG900) on the Short SC.1
A United Kingdom military aircraft registration mark, informally and unofficially known as its 'serial number', is a specific aircraft registration scheme used to identify individual military aircraft
Serial number
…SQL – Relational database programming language (serial identifiers for databases) United Kingdom military aircraft registration number – Identification for United Kingdom military aircraft United States military aircraft serial numbers…
Close-up of registration mark XR220 on BAC TSR-2.
English Electric Canberra PR.9 showing large underwing registration marks (XH134).
2699, a Royal Aircraft Factory B.E.2 from the 1910s.
PZ865, a Hawker Hurricane from the 1940s.