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अंतरराष्ट्रीय ओलंपिक समिति (आईओसी) तीन वर्णो के संक्षिप्त नाम को राष्ट्र कोड के रूप में ओलिंपिक खेलों में भाग लेने वाले प्रत्येक एथलीटों के समूह के लिए प्रयोग करती हैं। प्रत्येक कोड आमतौर पर एक राष्ट्रीय ओलम्पिक समिति को परिभाषित करता हैं, परन्तु अनेक कोड एसे भी हैं जो कि पिछले खेलो में अन्य उदाहरणो के लिए इस्तेमाल किये गए हैं, जैसे कि कई देशों के एथलीटों से निर्मित टीमे या किसी भी राष्ट्र का औपचारिक रूप से प्रतिनिधित्व नहीं करने वाले एथलीटों के समूह।
अनेक आईओसी कोड मानक आईएसओ 3166-1 अल्फा-3 कोड से अलग हैं। अन्य खेल संगठन, जैसे कि फीफा, अंतर्राष्ट्रीय बास्केटबॉल महासंघ और राष्ट्रमंडल खेल परिसंघ, इसी तरह के राष्ट्र कोड का उपयोग अपनी संबंधित टीमों को संदर्भित करने के लिये करतें हैं।
There are 205 current एन॰ओ॰सी॰s (National Olympic Committees) within the Olympic Movement. The following tables show the currently used code for each एन॰ओ॰सी॰ and any different codes used in past Games, per the official reports from those Games. Some of the past code usage is further explained in the following sections. कोडs used specifically for a Summer Games only or a Winter Games only, within the same year, are indicated by "S" and "W" respectively.
ANZ is now used in the IOC's medal database[5] to identify the team from Australasia, composed of athletes from both Australia and New Zealand for the 1908 and 1912 Games. By 1920, both nations competed separately.
EUA is now used in the IOC's medal database[5] to identify the Unified Team of Germany, composed of athletes representing the एन॰ओ॰सी॰s of both East Germany and West Germany for the 1956–1964 Games. At the time, the team was simply known as Germany in the official reports for those six Games.
EUN was used in 1992 (both Summer and Winter Games) for the Unified Team, composed of athletes from most of the ex-republics of the Soviet Union. Only the Baltic states were able to compete as independent teams in 1992; the other twelve new nations competed independently for the first time in 1994 and/or 1996.
ZZX is used to identify medals won by mixed teams of athletes from multiple nations (such as the combination of France and Great Britain, for example), a situation that happened several times in the Games of 1896, 1900, and 1904.
(ed.) Shinano Mainichi Shimbun (1998). "Volume Three Competition Results and Participants". The XVIII Olympic Winter Games Official Report(PDF). The Organizing Committee for the XVIII Olympic Winter Games, Nagano 1998. पृ॰ 12. आई॰ऍस॰बी॰ऍन॰4-7840-9827-5. अभिगमन तिथि 2008-01-31.सीएस1 रखरखाव: फालतू पाठ: authors list (link)