A

/ˌsɪŋg(ə)l 'eɪ/, AA /ˌdʌb(ə)l 'eɪ/, AAA /ˌtrɪp(ə)l 'eɪ/ noun

letters that show how reliable a particular share, bond or company is considered to be

● These bonds have a AAA rating.

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‘…the rating concern lowered its rating to single-A from double-A, and its senior debt rating to triple-B from single-A’ [Wall Street Journal]

COMMENT: The AAA rating is given by Standard & Poor’s or by Moody’s, and indicates a very high level of reliability for a corporate or municipal bond in the US