Digit Zero

The Digit Zero at U+0030 is the Basic Latin numeral for the value zero, used to show absence of quantity, a placeholder in positional numbers, and the digit before one. It is the ASCII-compatible zero found on standard keyboards and in ordinary decimal writing, as in 0, 10, 205, and 0.75. Its largest everyday role is in numbers: addresses, prices, dates, measurements, phone numbers, account identifiers, and codes all use it as a digit. In positional notation it changes magnitude by holding a place, so 105 differs from 15, and leading zeroes may be meaningful in strings such as ZIP codes, product numbers, or time formats like 09:30. In mathematics, science, and computing, 0 commonly denotes the additive identity, a null result, an origin point, a boundary value, or a false/off state depending on context. Programmers also see it in zero-based indexing, binary notation, status values, and numeric literals, while engineers and data analysts use it in tables, coordinates, tolerances, and measurements. A practical source of confusion is its visual similarity to the capital letter O in many fonts, especially in passwords, serial numbers, and handwritten notes. Slashed or dotted zero styles are often chosen in technical typefaces to make that distinction clearer.