The highest possible credit rating assigned to bonds or financial instruments, indicating the lowest risk of default.
From the grading system using repeated letter 'A', the highest grade in educational contexts. First used in financial credit ratings in the early 20th century by rating agencies to indicate superior creditworthiness.
This triple-A rating system actually borrowed from the simple school grading convention, proving that sometimes the most sophisticated financial instruments rely on concepts we learned in elementary school. Interestingly, very few entities maintain AAA ratings today - even the United States lost its perfect AAA rating from some agencies after 2011.
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