(n) telephone number
(n) registration number
(P)
(n) extension number
(n) (comp) directory assistance
(n) number sign
(n) (comp) numbering plan
(n) (comp) station-to-station (comms)
(n) (comp) class number
(n) (comp) character number
(n) postal code
(n) confirmation number
(n) (comp) logical number
(n) (comp) job number
(n) (comp) bit number
(n) (comp) build number
(n) (comp) page number
(n) (comp) port number
(n) (comp) label number
(n) (comp) link number
(n) (comp) level-number
(n) (comp) subscriber number
(n) (comp) current line number
(n) (comp) child-sequence-number
(n) (comp) Post Office box address
P.O.box address
(n) (comp) parent-sequence-number
(n) registry number column
(n) (mobile phone) number portability (introduced to Japan in October 2005)
(n) (comp) access number
(n) (comp) cluster number
(n) Koechel number (catalogue of Mozart's music)
