Junmai-shu (pure rice wine; no adding of distilled alcohol)
NOTE: Until recently, at least 30% of the rice used for Junmai sake had to be milled away. But the laws have changed, and Junmai no longer requires a specified milling rate. Nevertheless, the amount milled away must, by law, be listed somewhere on the label.
Honjozo-shu (at least 30% of rice polished away; a tad of distilled alcohol is added)
Ginjo-shu (at least 40% of rice polished away; with or without alcohol added; if bottle is labeled Ginjo, it means distilled alcohol was added; if labeled Junmai Ginjo, it means no alcohol added)
Daiginjo-shu (at least 50% of rice polished away; again with or without added alcohol; if bottle is labeled Daiginjo, it means distilled alcohol was added; if labeled Junmai Daiginjo, it means no alcohol added)
Namazake (special 5th designation for unpasteurized sake; incorporates all four above)