ASCII 52 — 4

Four is a power of two (2²) and appears throughout computing as the nibble — a 4-bit unit that represents exactly one hexadecimal digit (0–F). IPv4, the Internet Protocol version still carrying the majority of global network traffic, uses 32-bit (4-byte) addresses. In programming style conventions, four spaces is the most common indentation width, recommended by official style guides for Python (PEP 8), JavaScript (many linters), Java, and numerous other languages.

The ten decimal digit characters (0–9) occupy consecutive ASCII codes 48 through 57, arranged sequentially by deliberate design. This placement enables the classic parsing technique of subtracting the character '0' (code 48) from any digit character to yield its integer value — a trick embedded in virtually every text processing system and parser written in the past six decades. Digit characters are fundamentally distinct from numeric values: the character '5' is stored as byte value 53, not the integer 5.

In the ASCII encoding table, Digit 4 is assigned code point 52 in decimal (0x34 hexadecimal, 064 octal, 00110100 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 Digit 4 works reliably across all operating systems, programming languages, and internet protocols.