| Subject | English | Thesaurus |
| Nasdaq, abbr. | Affinity International Travel Systems | AFFT |
| Nasdaq, abbr. | American International Group, Inc. Options | WAPAT |
| Nasdaq, abbr. | American International Group, Inc. Options | WAPAN |
| Nasdaq, abbr. | American International Group, Inc. Options | WAPAL |
| Nasdaq, abbr. | American International Group, Inc. Options | WAPAR |
| st.exch., abbr. | American International Group, Inc. options | ZPW |
| railw., abbr. | American International Rail Services LLC | AIRX |
| busin., abbr. | Australian International Moving Services | AIMS |
| abbr., scottish | Aviation Services International Benelux BV | ASI (Netherlands) |
| NYSE., abbr. | Burns International Services Corporation | BOR |
| abbr., ecol. | Common International Classification of Ecosystem Services | CICES (Alexander Oshis) |
| vet.med., abbr. | Convention on International Trade in Endangered Species of Wild Fauna and Flora | CITES |
| tradem., abbr. | Cooperative Services International | CSI |
| Nasdaq, abbr. | Cybernet Internet Services International | ZNET |
| abbr., foreig.aff. | Electoral Reform International Services | ERIS |
| abbr., med. | Executive & International Medical Services | EIMS (iglav-iglav) |
| NGO, abbr. | Hepatitis Foundation International | HFI |
| NGO, abbr. | Holt International Children's Services | HICS |
| tradem., abbr. | Information Services International | ISI |
| interntl.trade., abbr. | International Approval Services | IAS |
| mil., abbr. | International Association of Security Services | IASS |
| law, court | International Centre for ADR | International Centre for Amicable Dispute Resolution (russiangirl) |
| abbr. | International Classification of Goods and Services | ICGS (The Nice Classification is a system of classifying goods and services for the purpose of registering trademarks. The latest 10th version of the system groups products into 45 classes (classes 1-34 include goods and classes 35-45 embrace services), and allows users seeking to trademark a good or service to choose from these classes as appropriate. Since the system is recognised in numerous countries, this makes applying for trademarks internationally a more streamlined process. The classification system is specified by the World Intellectual Property Organization (WIPO). Alexander Demidov) |
| abbr. | International Classification of Goods and Services | Nice Classification (The Nice Classification is a system of classifying goods and services for the purpose of registering trademarks. The latest 10th version of the system groups products into 45 classes (classes 1-34 include goods and classes 35-45 embrace services), and allows users seeking to trademark a good or service to choose from these classes as appropriate. Since the system is recognised in numerous countries, this makes applying for trademarks internationally a more streamlined process. The classification system is specified by the World Intellectual Property Organization (WIPO). Alexander Demidov) |
| abbr. | International Conference on Multimedia Services and Access Networks | MSAN |
| abbr. | International Conference on Telecommunications in Modern Satellite, Cable, and Broadcasting Services | TELSIKS |
| abbr., pharma. | International Contract Services Expo | ICSE (hatamota) |
| abbr. | International Council of Home-Help Services | ICHS |
| abbr. | International Currency Options Master Agreement | ICOM (asia_nova) |
| abbr., st.exch. | International Financial Services Association | IFSA (Merc) |
| abbr., scottish | International Marketing Services Ltd | IMS (USA) |
| abbr., scottish | International Military Services | IMS (UK) |
| abbr., mil., BrE | International Military Services | IMS |
| busin., abbr. | International Options Clearing Corporation | IOCC |
| med., abbr. | International Patient Services | IPS |
| tech., abbr. | International Physical Protection Advisory Services | IPPAS |
| busin., abbr. | International Securities Services Association | ISSA |
| abbr., scottish | International Security Services Ltd | ISS (UK) |
| abbr., fin. | International Standard on Related Services | ISRS (hora) |
| univer., abbr. | International Student Services Management | ISSM |
| telecom., abbr. | International Toll Free Services | ITFS |
| abbr. | International Total Services, Inc. | ITS (компания, предоставляющая различные услуги по обеспечению работы и безопасности международных аэропортов yulia_mikh) |
| abbr., railw. | International Union of Railway Medical Services | UIMC (фр. аббр: Union internationale des services médicaux des Chemins de fer, см. http://bit.ly/uicUIMCfr ilghiz) |
| abbr., qual.cont. | Laboratory Quality Services International | LQSi (Atenza) |
| abbr., econ. | London International Financial Futures and Options Exchange | LIFFE (Vosoni) |
| st.exch., abbr. | London International Financial Futures & Options Exchange | LIFFE |
| abbr., post | Mil International Dispatch & Accountability System | MIDAS |
| Nasdaq, abbr. | Mining Services International Corporation | MSIX |
| NGO, abbr. | Missionary Care Services International | MCSI |
| Nasdaq, abbr. | Pacific International Services Corporation | PISC |
| NGO | Population Services International | Population Services International (iwona) |
| abbr. | Public Services International | PSI |
| tradem., abbr. | Quality Services International | QSI |
| abbr. | Shell Services International | SSI (Yeldar Azanbayev) |
| abbr., scottish | Thomson Field Services International | TFSI (France) |
| Nasdaq, abbr. | Travel Services International, Inc. | TRVL |
| AMEX., abbr. | United Surgical Partners International options | QPJ |
| relig., abbr. | Vatican International Services Agency | VISA |
| tradem., abbr. | Visa International Services Association | VISA |
| st.exch., abbr. | Voice Mobility International, Inc. options | VMY |
| tradem., abbr. | Weather Services International | WSI |
| meteorol., abbr. | Working Group on Meteorological Services to be Provided to International General Aviation | METSIGAG |
