Both of these are metrics used in surveys.
System Usability Scale. A 10 item questionnaire that assesses the usability and learnability of a product. This is often considered the industry standard.
Usability Metric for User Experience. A 4 item questionnaire that assesses the perceived usability of a product through effectiveness, efficiency, and satisfaction.
UMUX-Lite is an updated version that is only 2 questions, that fixes some of the main criticisms of UMUX. Both UMUX and UMUX Lite use a 5 or 7-point Likert Scale.