What chain is hyperliquid?

Could you elaborate on the term "hyperliquid" as it pertains to a blockchain? I'm curious to understand which specific blockchain technology or network is being referred to when someone mentions a chain being "hyperliquid." Are there any distinguishing characteristics or attributes that define a blockchain as hyperliquid, such as its speed, scalability, or interoperability? Additionally, how does this concept of hyperliquidity compare to traditional financial systems or other blockchain networks?