Serial number - Wikipedia

United States military aircraft serial numbers - Wikipedia

United Kingdom military aircraft registration number - Wikipedia

Olivetti typewriters - Wikipedia

File:US new format serial number.jpg - Wikipedia

File:US old format serial number.jpg - Wikipedia

Serial Designation J, Murder Drones Wiki

Engine number - Wikipedia

Olivetti typewriters - Wikipedia

Social Security number - Wikipedia

How to Check & Identify Your iPod's Generation: 3 Easy Ways

Dog tag - Wikipedia

Number - Wikipedia

NATO Stock Number - Wikipedia

Olivetti typewriters - Wikipedia

3 Ways to Find Your Mobile Phone's Serial Number Without Taking it Apart