abbr. store-traded, over-the-counter (=Over-the-counter) There are three interpretations of OTC. First, the most common explanation is that OTC is an acronym for Over The Counter in English, in the pharmaceutical industry specifically refers to non-prescription drugs; second, the OTC method refers to the inter-bank foreign exchange market transactions subject to bilateral credit as the basis for the spot foreign exchange transactions through the independent bilateral inquiries, bilateral clearing. Third, in the field of welding equipment, OTC denotes the Japanese Osaka-style