Ａ１

noun, noun which may take the genitive case particle 'no'

A1; top class; best quality

Used to describe something of the highest grade, quality, or rank, often in commercial or evaluative contexts.

• このレストランはＡ１の評ひょう価かを受うけている。

  This restaurant has received an A1 rating.

• 彼かれはＡ１の成せい績せきで卒そつ業ぎょうした。

  He graduated with top-class grades.