What does the "SS" in SS-G950FD mean?

I googled it and couldn't find an answer. So I bought an S8 off ebay (link at end of post) and it all looked legit to me. Anyway it was taking a while for DPD to pick it up for delivery so I emailed them and in the reply email I saw this "Note: SS-G950FD-BK" and thought what the hell......all samsungs have had SM not SS. I was already skeptical about ebay and because of the delivery delay and now this has worried me. Does anyone know what it means? Is it still a legit S8?

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