QF

Qf is a two-letter combination that serves as an abbreviation in several fields, and there is no single universally accepted meaning. The interpretation of Qf depends on context and capitalization, and different domains may use it to denote distinct concepts.

In sports and tournament schedules, QF (often written as QF) stands for the quarterfinals, the round featuring the eight remaining competitors. It is commonly used in brackets, match reports, and calendars to mark this stage of a competition.

In aviation, the designator QF is the IATA airline code for Qantas Airways. This code appears on tickets, flight schedules, and departure/arrival boards to identify the airline.

In logic and computer science, QF is used as a prefix to indicate quantifier-free formulas or theories, particularly in the area of Satisfiability Modulo Theories (SMT). A QF formula contains no quantifiers, which influences how problems are decided and how solvers operate.

Qf can also appear in other specialized contexts where capitalization varies. For example, it may appear on product labels or catalogs to signal certain quality-related designations, though such usage is not standardized and should be inferred from surrounding text.

Because Qf has multiple potential meanings, readers should determine its sense from the domain, accompanying terminology, and capitalization used in the source. When encountered, it is advisable to check the specific context to identify whether it refers to a sports stage, an airline code, or a technical notation in logic or computing.