ASCII 11 — VT

Vertical Tab (VT) moves the cursor down to the next vertical tab stop, analogous to how HT works horizontally. Written as '\v' in programming escape sequences, VT was primarily useful for rapid vertical positioning on line printers and early CRT terminals. It is one of the least commonly used ASCII control characters in modern computing. Some programming languages include VT in their definition of whitespace characters while others do not, leading to subtle and difficult-to-debug portability issues across platforms.

Whitespace characters create visual separation and structural formatting in text without rendering a visible glyph. Whitespace handling is a critical design consideration across programming languages, markup systems, and data formats: Python uses indentation for block structure, HTML collapses consecutive spaces into one, and tools like linters flag inconsistent whitespace patterns. The interplay between spaces, tabs, line feeds, and other whitespace characters has produced some of the longest-running formatting debates in the entire history of software development.

In the ASCII encoding table, Vertical Tab is assigned code point 11 in decimal (0x0B hexadecimal, 013 octal, 00001011 binary). The 7-bit ASCII standard, first published in 1963 by the American Standards Association, defines exactly 128 characters that remain the foundation of text encoding systems worldwide. UTF-8, the dominant encoding on the modern web, is fully backward compatible with ASCII — every ASCII character is encoded as the identical single byte in UTF-8, guaranteeing that Vertical Tab works reliably across all operating systems, programming languages, and internet protocols.