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By replacing the digits of a telephone number with the corresponding letters, it is sometimes possible to form a whole or partial word, an acronym, abbreviation, or some other alphanumeric combination. Phonewords are the most common vanity numbers, although a few all-numeric vanity phone numbers are used.
The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
an atom is either a number or a symbol; a number is an unbroken sequence of one or more decimal digits, optionally preceded by a plus or minus sign; a symbol is a letter followed by zero or more of any characters (excluding whitespace); and; a list is a matched pair of parentheses, with zero or more expressions inside it.
Pages in category "Letter–number combination disambiguation pages" The following 200 pages are in this category, out of approximately 5,051 total. This list may not reflect recent changes .
Keypad used by T9. T9's objective is to make it easier to enter text messages.It allows words to be formed by a single keypress for each letter, which is an improvement over the multi-tap approach used in conventional mobile phone text entry at the time, in which several letters are associated with each key, and selecting one letter often requires multiple keypresses.
This table of three-letter acronyms contains links to all letter-letter-letter combinations from AAA to DZZ, listed in the form [[{{letter}}{{letter}}{{letter}}]].. As specified at Wikipedia:Disambiguation#Combining terms on disambiguation pages, terms which differ only in capitalisation are commonly combined into a single disambiguation page.
The list of all single-letter-single-digit combinations contains 520 elements of the form [[{{letter}}{{digit}}]] and [[{{letter}}-{{digit}}]]. In general, any abbreviation expansion page is located at the shorter link. Once the abbreviation page has been created, the hyphen link should {{R from abbreviation}} to the other page.