What does ACS stand for?

Excuse me, I'm curious to know the abbreviation's meaning. Could you please elaborate on what ACS stands for in the context of cryptocurrency and finance? I've come across this acronym in a few discussions but haven't been able to find a clear definition. I'm sure it's a crucial concept in this domain, and I'd appreciate your insight into its significance and possible applications. Your expertise in this field would be invaluable in clarifying this for me. Thank you for your time and assistance.