In math, "py" is not a standard abbreviation or symbol that has a specific meaning or definition.
It's possible that "py" is being used as an abbreviation or shorthand for a specific term or concept within a particular context, but without more information, it's impossible to say for certain what that might be.
If you can provide more context or information about where you encountered the term "py" in math, I may be able to provide a more specific answer.
