Hh

hh is a two-letter string that does not have a single universal meaning. Its interpretation depends on the domain and the surrounding context.

In time and date formatting, hh commonly denotes the hour in a 12-hour clock in many programming languages and libraries, while HH denotes the hour in a 24-hour clock. For example, a pattern like hh:mm might display times such as 09:45, often accompanied by an AM/PM indicator in 12-hour formats. The exact semantics can vary between languages and frameworks, so the surrounding documentation should be consulted for precise rules.

In text processing and computing, hh can appear as a literal string in regular expressions or data strings, where it matches two consecutive h characters. It can also serve as a variable name or placeholder in sample code, depending on the author’s conventions.

Other uses of hh arise in internal naming schemes or domain-specific abbreviations, where the letters may stand for a concept defined within a particular project or organization. Because hh is not unique to a single field, disambiguation relies on context, capitalization, and accompanying identifiers.

Overall, hh is best understood as a versatile, context-dependent token rather than a fixed term. When encountered, it is useful to examine the surrounding text, documentation, or code to determine which meaning applies.