honor system means: This is the practice of accepting merchandise and not counting it or inspecting the cases. Instead, you trust that both the shipper and the vendor have followed the orders. Spot counting is usually done in conjunction with an honor system. (in Cooking Dictionary)

What else does honor system mean?

A system where people are trusted to be honest and are therefore not monitored directly, although they might get a benefit by being dishonest. (in Merlin Dictionary)