Is the word an or a used prior to an acronyn that starts with s or m example I took an SAT test or I took a SAT test?
Use "an" before a vowel sound and "a" before a constanant. If
you are pronouncing SAT as the word sat, then you would say "a sat
test" but if you are pronouncing each letter separately, then it is
"an ess ay tee test".