203

203 is a natural number that comes after 202 and before 204. In mathematics, 203 is an odd composite number with prime factorization 7 × 29, making it a semiprime. In various numeral systems, it is written as CCIII in Roman numerals, 11001011 in binary, and CB in hexadecimal. Decimal 203 is also related to other notations: the Unicode code point U+00CB represents the character Ë, and the hexadecimal value CB equals the decimal 203.

The number 203 appears in several real-world contexts. In telecommunications, area code 203 serves southwestern Connecticut, including parts of the Bridgeport and New Haven metro areas. In history, 203 CE falls in the early third century, during the reign of the Roman Emperor Septimius Severus, a period marked by Roman military and political activity in the eastern Mediterranean. While the year 203 itself is not singled out for a universally known singular event, it is part of the broader chronology of the Roman imperial era.

In computing and information technology, HTTP status code 203 means Non-Authoritative Information. A response with this status indicates that the information may have been gathered from a local or third-party copy rather than the origin server, rather than a standard successful result. The code is part of the broader family of HTTP status codes used to communicate the result of a client's request.

Overall, 203 functions as a numeric identifier across mathematics, numerals, timekeeping, and modern infrastructures, illustrating how a simple number can have multiple, distinct meanings.