So it's about refrigerators? I agree with Jon. It means Sub Normal (10-32 deg climate operating temp). The next one up is N, which is Normal. http://www.whitegoodshelp.co.uk/climate-classes-for-fridges-freezers-and-fridge-freezers/ Scroll two-thirds of the page and you'll see a comment by user Anne.

subnormal

It may be, a.Serial Number b.From South to North. It would be better if you could paste complete sentence for precise answer.

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