A 1
From open-dictionary.com - the free dictionary.
Adjective
- Excellent, first class
- First-class condition ship- (Inferior grades are indicated by A 2 and A 3). - original use in Lloyd's Registry
A 1 was first applied to persons and other things by Dickens in 1837 in Pickwick Papers:
- 'He must be a first-rater,' said Sam.
- 'A1,' replied Mr. Roker.