A series of international standards ISO/IEC 25000, also known as SQuaRE (System and Software Quality Requirements and Evaluation), defines the characteristics by which the quality of a software product is assessed.
The updated ISO/IEC 25010 standard contains terminology for defining, measuring, and evaluating the quality of systems and software products. It presents eight characteristics of software quality, including functionality, performance level, compatibility, usability, reliability, security, maintainability, portability.
The ISO/IEC 25010 standard is a major revision of the ISO/IEC 9126 standard. The new standard adds additional characteristics and sub characteristics that describe in more detail the process of software product quality, as well as clarifications and regrouping of characteristics for a clearer understanding of them.
More details about the updated standard can be found on ISO website.