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| 简称 | 全称 |
| AA | International organizations without location |
| QS | INSPEC [Information Service in Physics, Electrotechnology and Control] |
| QZ | INPADOC [International Patent Document Centre] |
| WO | WIPO [World Intellectual Property Organization] |
| XA | IAEA [International Atomic Energy Agency] |
| XC | CERN [European Organization for Nuclear Research] |
| XD | OECD [Organization for Economic Co-Operation and Development] |
| XE | CEC [Commission of the European Communities] |
| XF | FAO [Food and Agricultural Organization of the United Nations] |
| XH | AAEA [Arab Atomic Energy Agency] |
| XI | IIASA [International Institute for Applied Systems Analysis] |
| XJ | JINR [Joint Institute for Nuclear Research] |
| XK | WMO [World Meteorological Organization] |
| XM | ICSTI [International Centre for Scientific and Technical Information] |
| XN | NEA [Nuclear Energy Agency of the OECD] |
| XO | OAU [Organization of the African Unity] |
| XQ | CTBTO [Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization] |
| XR | ICRP [International Commission on Radiological Protection] |
| XS | ISO [International Organization for Standardization] |
| XT | UNIDO [United Nations Industrial Development Organization] |
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