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* [[Fictitious telephone number|Placeholder telephone numbers]] are often allocated from ranges such as ''[[555 (telephone number)|555]]'' (where +1-[area code]-555-1212 is reserved in North America for [[directory assistance]] applications) to avoid generating [[wrong number|misdialled calls]] to working numbers. In the United Kingdom, [[Ofcom]] has set aside a range of numbers in larger geographic area codes, as well as fictional area code 01632 (0632 having been the code for [[Newcastle upon Tyne]] until replaced by 091 in the 1980s), for dramatic use.<ref>{{cite web |url = https://stakeholders.ofcom.org.uk/telecoms/numbering/guidance-tele-no/numbers-for-drama |title = Telephone numbers for drama use (TV, Radio etc) |access-date = December 10, 2014}}</ref>

* Common placeholders for [[postcode]]s in Canada include A1A 1A1 (a real postal code for Lower Battery Road, [[St. John's, Newfoundland]]) and K1A 0B2 ([[Canada Post]] Place in [[Ottawa]]). H0H 0H0 is reserved by Canada Post for fictional use (specifically for the mythical [[Santa's workshop]]). In the United States, the [[ZIP Code]] 90210 (from TV series [[Beverly Hills 90210]]) is frequently used. Numeric codes with repeated or sequential digits like 12345 (a [[General Electric]] plant in [[Schenectady, New York]]), or 99999-9999 (unused but in a [[List of ZIP Code prefixes|prefix range]] for the vicinity of [[Ketchikan, Alaska]]) may also appear. 00000, which lies in an unused prefix range, can be used without confusion.

* In computing, some [[Magic number (programming)|magic numbers]] (and other uses of hexadecimal numbers) apply [[hexspeak]] to create memorable hexadecimal values, such as <tt>0xdeadbeef</tt>.

=== People ===