S rank

Etymology
shū (秀) + rank. S can be given as a letter grade for exceptional work in Japanese schools.

Noun

 * 1) (video games) An exceptional rank given on objective, mission, or level in a game. Typically the highest achievable such rank.

Verb

 * 1) (video games) To achieve a S rank

Adjective

 * 1) (by extension) Of exceptional quality in its class