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31st International Olympiad in Informatics
| Miniature Sheet |
| First Day Cover |
About 31st International Olympiad in Informatics
The International Olympiad in Informatics (IOI) is an annual international informatics competition for high school students from various invited countries, accompanied by social and cultural programmes. It is one of the five international science Olympiads and is one of the most prestigious computer science competitions in the world.
The 31st International Olympiad in Informatics (IOI 2019) will be held in Baku, Azerbaijan from 4 to 11 August. The IOI 2019 is financially supported by the Ministry of Education of the Republic of Azerbaijan and is powered by a global partnership with Acer.
Azerbaijan - Recommended stamp issues
WOPA+ recommended stamp issues
| Veteran Tractors |
| Issued: 04.01.2023 |
| ›Aland Islands |
| Effigy of H.S.H Prince Albert II - Green Letter Rate |
| Issued: 03.01.2023 |
| ›Monaco |
| Medicinal Plants |
| Issued: 03.01.2023 |
| ›Romania |
| Honour Guard of the President of the Slovak Republic |
| Issued: 02.01.2023 |
| ›Slovakia |
| Year of the Rabbit |
| Issued: 05.01.2023 |
| ›Guernsey |
| Dimitrie Cantemir, 350th Anniversary of his Birth |
| Issued: 16.01.2023 |
| ›Romania |
| Lunar New Year - Year of the Rabbit |
| Issued: 05.01.2023 |
| ›Jersey |
| St. Elizabeth’s Church in Parnu |
| Issued: 06.01.2023 |
| ›Estonia |
| Music Giants VII - Iron Maiden |
| Issued: 12.01.2023 |
| ›Great Britain |
