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Explanation: I would presumt that each line of the order corresponds to a code, part of which is comprised of a letter of the alphabet, presumably with the letter standing for the component or subgroup.
Thomas Roberts Works in field Native speaker of: English, Italian PRO pts in category: 919
7 mins confidence: peer agreement (net): +1
Explanation: as opposed to the numeric part of the code
Judith McLean United Kingdom Local time: 21:17 Works in field Native speaker of: English PRO pts in category: 13
Explanation: The word esponente is often used in Italian not just for the mathematical exponent (to the power ...) but to any superscript (small character to the right and above another). It could be one or more letters. Obviously you really need to see the code.
Obviously the numerical type is more common.