I'm getting my head around customising an existing mod and need to know what the prefixes such as p/pd/pov etc. mean in commands such as:

p.products_type
pov.products_options_values_name
etc.

I can do my own research but am not sure what to Google for, I've tried 'SQL prefix' but that doesn't seem right.

A point to an information resource would be a great help.

Thanks