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Caps marked with a 3 digit number generally follow the convention that the first two numbers are the first two digits and the third number is the number of trailing zeros. The value is in pF, e.g. 472 would be 47 with two trailing zeros or 4700 pF. Your part labeled 100 is probably 10 with no trailing zeros or 10 pF.
Letters are used for voltage rating and temp coeff.
A search on the subject will yield better explanations than this one.