telephone number; phone number
student number (for seating, etc. in class)
personal identification number; PIN; password number
mobile phone number; cell phone number
numbered tag; numbered ticket
number on the back of a player's uniform; uniform number; shirt number; squad number
(manufacturer's) serial number
serial number; consecutive number
winning number (e.g. in lottery); lucky number
account number (bank, etc.)
reference number; serial number
model number; model designation
confirmation number; reservation number; reference number
identification number; confirmation number; authentication number
item number; product ID number; reference number
identity number; national identification number; national identity number; personal identity number
social security number (USA); SSN
order number; ticket number; tracking number
Köchel number (catalogue of Mozart's music)
national identification number system; My number system
personal identification number; PIN; password number
directory or book of numbers (e.g. telephone nos)
mobile phone number; cell phone number
tracking number (e.g. for orders)
reference number; order number; tracking number
International Standard Book Number; ISBN
reference number; order number; tracking number
corporate number; 13-digit identification number for corporations
station-to-station (comms)
Post Office box address; P.O.box address
reference number; order number; tracking number
reference number; order number; tracking number
physical delivery office number
relative generation number
International Standard Serial Number; ISSN
tax identification number; TIN
taxpayer identification number (in the US, Germany, etc.)
region code (e.g. for DVDs); area code (telephone network)
external character number
act number (within a year); law number
universal pension number; common number shared between different pension schemes; basic pension number
(mobile phone) number portability (introduced to Japan in October 2005)
license plate for small vehicles (e.g. subcompact car, motorcycle)
number sign; hash sign; pound sign