tendigit

Tendigit is a term used in mathematics, computing, and telecommunications to describe concepts related to numbers that contain exactly ten decimal digits or to the dialing of such numbers. In mathematics, a ten-digit number is an integer from 1,000,000,000 to 9,999,999,999 inclusive. The notion is common in data modeling to specify fixed-width numeric fields that store exactly ten digits; such fields appear in legacy databases, financial records, and identifiers where consistent width simplifies sorting and parsing.

In computing and software development, ten-digit representations are often stored with leading zeros to preserve width, for example 123 becoming 0000000123. This technique is used in indexing, batch processing, and serialization when uniform field lengths are required.

In telecommunications, ten-digit dialing refers to the practice of dialing a full ten-digit telephone number within areas that require the area code to be included. In the North American Numbering Plan, a usual ten-digit local number consists of a three-digit area code plus a seven-digit local number. The term may also be used more generally to describe any fixed-length ten-digit telephone identifiers.

The concept is informal and may be used inconsistently across domains; precise terminology often prefers fixed-width ten-digit field, ten-digit integer, or ten-digit telephone number depending on context.

See also: decimal digit, fixed-width field, phone number, NANP.

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