In Europe Union (and other countries probably, too), the superior rating is an official classification[1]. The ranking from worst to best looks like this:
★ ★S ★★ ★★S ★★★ ★★★S ★★★★ ★★★★S ★★★★★ ★★★★★S
[1]Wikipedia.org
In Europe Union (and other countries probably, too), the superior rating is an official classification[1]. The ranking from worst to best looks like this:
★
★S
★★
★★S
★★★
★★★S
★★★★
★★★★S
★★★★★
★★★★★S
[1]Wikipedia.org