Definition of sss
When writing card values and suits to describe a hand, even in French, most of the time, the suit of the cards will be written in English. The S represents the "spade" (spade). So, if a flop falls 5 of spades, 6 of spades and 7 of spades, we will write that the flop came 5s-6s-7s or 567sss.
SSS or ss or ssss
Here, it is only variations on the same theme. But when you understand the principle, you know what it is all about. If you write to a friend that you had 56ss out of 789ss, it means that you had a 5 of spades and a 6 of spades on a flop,789 on which there were 2 spades. Or if you say, "I had Ace5 on 789Jsss", you had the ace of spades, a 5 of spades in an X color that is not the spade on a board that had 3 spades. The other colors are diamond (d), club (c) and heart (h), which is tile, clover and heart in French.