What is a ston?

Excuse me, could you please clarify what you mean by "ston"? In the context of cryptocurrency and finance, this term is not commonly used. Is it a specific type of token, a unit of measurement, or perhaps a slang term within a particular community? Without further context, it's difficult to provide an accurate definition. Could you please elaborate on the context in which you encountered this term, or provide any additional information that might help me understand its meaning?