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G20 — the Group of Twenty
G20 — a forum of the world's largest economies, accounting for about 85% of world GDP. Founded in 1999 to coordinate financial policy after the Asian crisis.
History
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20/20 vision
Visual acuity of '20/20' (or 1.0 in the metric system) is the standard of normal vision. It means a person sees at 20 feet what should normally be seen at 20 feet. Introduced by ophthalmologist Herman Snellen in 1862.
Numerology
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Twenty-one — blackjack
The goal of the card game blackjack is to score exactly 21 points or get as close as possible. The game appeared in the 17th century in Spain and France under the name 'vingt-et-un' (twenty-one) and became one of the most popular casino games.
Culture