0123

0123 is a four-character sequence made from digits 0, 1, 2, and 3. In writing and data, it can serve as a simple identifier, a product or model code, or a placeholder illustrating zero-padding and fixed-width fields.

Numerically, 0123 can be read in two common ways depending on context. As a decimal value with leading zeros, it represents 123. In programming languages that treat a leading 0 as indicating octal, 0123 denotes the octal number 0123, which equals decimal 83. Modern languages typically require explicit base prefixes (such as 0o123) for octal to avoid ambiguity; some languages disallow leading zeros in decimal literals.

String context: when enclosed in quotes, '0123' is simply a string consisting of the characters 0, 1, 2, and 3 and has length 4. It may be used in examples involving padding, fixed-width fields, or text processing.

Applications: in data formats and test cases, 0123 is commonly used as a short, lexically simple identifier or code. It can also appear as a year-like label in fictional or historical datasets, though it has no intrinsic historical meaning.

See also: octal numeral system, leading zero, numeric literals, zero padding.