Since does not appear to be a widely recognized term, product, or piece of software in public databases, I need a little more context to give you something truly useful.
Is it part of a (like a "Hadley Sample") used in climate science or statistics?
Is it a or a specific code snippet you've encountered?
To help me point you in the right direction, could you clarify what this relates to? For example:
If you can share where you saw the term or what you're trying to achieve with it, I'll be able to track down the specifics for you.