What is XT tax?

Excuse me, could you elaborate on the concept of XT tax? I've heard this term being discussed in the cryptocurrency community but I'm not entirely sure what it entails. Is it a specific tax levied on transactions involving a particular cryptocurrency? Or is it a broader concept that applies to multiple cryptocurrencies? Furthermore, what are the implications of XT tax for investors and traders? Does it affect the overall profitability of crypto transactions? I'd appreciate a concise yet comprehensive explanation of this term.