I've seen fruit marked as "IPM" in my local grocery store. That refers to integrated pest management, a general philosophy of controlling pests through understanding of their physiology, behavior, and interaction with the artificially-managed ecosystem, sometimes using synthetic chemical pesticides but in the smallest quantities that achieve the desired effect.
http://ipm.ucanr.edu/
I don't believe use of the term is regulated, though. So in practice that may just be a nicer-sounding synonym for "conventional".