0x0D

0x0D is the hexadecimal value representing decimal 13. In ASCII and Unicode contexts, it corresponds to the control character known as Carriage Return (CR), with the Unicode code point U+000D. In UTF-8, the character is encoded as a single byte 0x0D.

Historically, a carriage return moved the printing cursor to the beginning of the current line on typewriters and early printers. In modern computing, CR is used as a line-ending control character. In Windows environments and many network protocols, lines are terminated with a two-byte sequence consisting of CR followed by Line Feed (0x0D 0x0A), known as CRLF. By contrast, Unix-like systems typically use just LF (0x0A) for line endings, and some older Macintosh systems used CR alone.

In software development, CR is commonly represented in strings by the escape sequence \r in languages such as C, Java, and Python. In data streams and network protocols, 0x0D may appear as a raw byte; some systems convert CRLF sequences to a single newline during processing. The code point U+000D is the formal Unicode designation, and its UTF-8 encoding remains the single byte 0x0D.

Because CR is a non-printable control character, its primary relevance lies in line-ending conventions and cursor control rather than textual content. Improper handling of 0x0D can lead to display or parsing issues in cross-platform text processing and network communication.