U+005B "[" Left Square Bracket Unicode Character

U+005B "[" Left Square Bracket is a fundamental punctuation mark used in computing and written text to denote the beginning of a grouping or enclosure. It is a key element in programming languages, where it defines array indices, list components, or function arguments, and in mathematics for indicating intervals or matrix notation. In typography, it serves as the opening counterpart to the right square bracket "]," forming a symmetric pair for containing auxiliary information or markup in plain text, encoding, and data formats like JSON or XML. Its consistent codepoint in the ASCII standard ensures broad interoperability across digital systems and platforms.