For branched ISO defines abbreviated terms for the basic polymers used in plastics, symbols for components of these terms, and symbols for special characteristics of plastics. ISO Got a question? The objectives of the standard are to prevent the occurrence of more than one abbreviated term for a given ISO は、フィラーおよび補強材を指す用語の統一記号を指定しています。. Published. Plastics — Symbols and abbreviated terms — PartFillers and reinforcing materials Plastics — Symbols and abbreviated terms. ISO Got a question? Part P