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A standard ITU-T E.161 keypad used for text messaging. E.161 is an ITU-T recommendation which defines the assignment of the basic 26 Latin letters (a to z) to the 12-key telephone keypad. Uses for this mapping include: Multi-tap and predictive text systems Forming phonewords from telephone numbers Using alphabetic characters (eg as a mnemonic) in a personal identification number[1] ETSI ETS 300 640 and ISO 9995-8 also address this. Language-specific letters (e.g. ü, é, å, ä, ö) as well as other characters (e.g. ‘€’ or ‘@’) are not addressed and has led to a variety of inconsistent solutions for European languages.[2] Contents 1 See also 2 References 3 Further reading 4 External links // See also E.164 References ^ ISO 9564-1:2002 Banking — Personal Identification Number (PIN) management and security — Part 1: Basic principles and requirements for online PIN handling in ATM and POS systems, Annex E.4 ^ Standardization Supporting Cultural Diversity. Further reading Character Repertoires, Ordering and Assignment to the 12-key Telephone Keypad for European Languages and Languages Used in Europe. External links E.161 Arrangement of digits, letters and symbols on telephones and other devices