It depends on the context. For example, in the Aerospace Supply Chain, the term key characteristic is used. AS9100 B definesCan anybody define what is the difference between Key Product characteristics (KPC) and Critical Characteristics (CC)?
AS9100 B said:Key Characteristics: The features of a material, process, or part whose variation has a significant influence on product fit, performance, service life, or manufacturability.
product characteristic or manufacturing process parameter which can affect safety or compliance with regulations, fit, function, performance or subsequent processing of product.