What does RSS stand for rubber?

I'm quite curious about abbreviations and acronyms, especially those that seem to defy logic. Could you please clarify something for me? I've come across the term 'RSS' being associated with rubber, but I'm puzzled. Could you tell me, what does RSS actually stand for when it's linked to rubber? It doesn't seem to fit the common understanding of RSS, which I associate with Really Simple Syndication in the context of web feeds. Is there a different meaning or context in which RSS is used to represent rubber? I'd really appreciate it if you could shed some light on this matter for me.