# 20 (number) – Wikipedia

(Redirected from Score (number))

Natural number

20 (twenty; Roman numeral XX) is the natural number following 19 and preceding 21. A group of twenty units may also be referred to as a score.[1][2]

## In science

### Biology

• The number of proteinogenic amino acids that are encoded by the standard genetic code.
• In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet, although it is commonly used to mean “perfect vision”. (Note that this applies only to countries using the Imperial system. The metric equivalent is 6/6.) When someone is able to see only after an event how things turned out, that person is often said to have had “20/20 hindsight”.[12]

## As an indefinite number

• A ‘score’ is a group of 20 (often used in combination with a cardinal number, i.e. fourscore to mean 80),[13] but also often used as an indefinite number[14] (e.g. the newspaper headline “Scores of Typhoon Survivors Flown to Manila”).[15]

## References

1. ^ John H. Conway and Richard K. Guy, The Book of Numbers. New York: Copernicus (1996): 11. “”Score” is related to “share” and comes from the Old Norse “skor” meaning a “notch” or “tally” on a stick used for counting. … Often people counted in 20s; every 20th notch was larger, and so “score” also came to mean 20.”
2. ^ “score | Origin and meaning of score by Online Etymology Dictionary”. www.etymonline.com. Retrieved 2020-08-16.
3. ^ “Sloane’s A002378: Pronic numbers”. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2020-11-30.
4. ^ “Sloane’s A000292 : Tetrahedral numbers”. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31.
5. ^ Weisstein, Eric W. “Vigesimal”. mathworld.wolfram.com. Retrieved 2020-08-16.
6. ^ “Sloane’s A071395 : Primitive abundant numbers”. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31.
7. ^ Weisstein, Eric W. “Icosahedron”. mathworld.wolfram.com. Retrieved 2020-08-16.
8. ^ Weisstein, Eric W. “Dodecahedron”. mathworld.wolfram.com. Retrieved 2020-08-16.
9. ^ Dunlap, R. A. (1997). The Golden Ratio and Fibonacci Numbers. World Scientific. pp. 72–73. ISBN 978-981-238-630-4.
10. ^ “God’s Number is 20”. Cube20.org
11. ^ Jonathan Fildes (August 11, 2010). “Rubik’s Cube quest for speedy solution comes to an end”. BBC News.
12. ^ “Definition of 20/20”. www.merriam-webster.com. Retrieved 2020-08-16.
13. ^ “Definition of SCORE”. www.merriam-webster.com. Retrieved 2020-08-16.
14. ^ “Biblical Criticism”, The Classical Journal 36:71:83ff (March 1827) full text
15. ^ “CBS News”, Scores of Typhoon Survivors Flown to Manila (November 2013)
16. ^ Cleaver, Dylan (2010-11-03). Brendon McCullum: Inside Twenty20. Hachette New Zealand. ISBN 978-1-86971-238-9.
17. ^ Ziemba, William T. (2017-08-23). The Adventures Of A Modern Renaissance Academic In Investing And Gambling. World Scientific. p. 352. ISBN 978-981-314-853-6. It has always been for a long time a maximum of 20 horses …
18. ^ Jordan, Bill. Opening Moves Made Easy: A new way to learn how to play Chess openings. Bill Jordan. there are 20 legal moves for White and 20 legal replies for Black
19. ^ Draper, Nick (2014-12-05). Exercise Physiology: For Health and Sports Performance. Routledge. p. 404. ISBN 978-1-317-90260-7. played over four 20 min quarters
20. ^ Harari, P. J.; Ominsky, Dave (2002). Basketball Made Simple: A Spectator’s Guide. First Base Sports, Inc. p. 58. ISBN 978-1-884309-13-7. Duration two 20-min. halves
21. ^ “International Ice Hockey Federation – Olympic Sport”. International Olympic Committee. 9 November 2020. Retrieved 22 January 2021.
22. ^ “Adulthood | Introduction to Psychology”. lumenlearning.com.
23. ^ “Japan’s Age of Majority Changed to 18 – Living the Japon.com”. www.japan-experience.com. Retrieved 19 March 2018.
24. ^ 20 – Harry Connick, Jr. | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
25. ^ 20+ – Baron Rojo | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
26. ^ Twenty – Bob Baldwin | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
27. ^ Twenty + – All-4-One | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-17
28. ^ 20 – Orbital | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
29. ^ 20 – Harry Connick, Jr. | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
30. ^ Twenty – Boyz II Men | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
31. ^ 20 (Twenty) – FT Island | User Reviews | AllMusic, retrieved 2020-08-17
32. ^ 20 – TLC | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
33. ^ Twenty – Chicane | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-17
34. ^ 20 – Jars of Clay | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
35. ^ Twenty – Robert Cray | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
36. ^ 20 – Africa Unite | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
37. ^ Twenty – Jebediah | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-17
38. ^ 20 – Kate Rusby | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
39. ^ Twenty – Lynyrd Skynyrd | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
40. ^ 20 – Hyukoh | User Reviews | AllMusic, retrieved 2020-08-16
41. ^ Twenty – Taking Back Sunday | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
42. ^ 20 – Pastora Soler | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
43. ^ 20 – The Gift | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-16
44. ^ 20 – Sofa Surfers | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-17
45. ^ 20 – Capo Plaza | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-17
46. ^ 20 – John Dahlbäck | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-17
47. ^ 20 – Ebbo Kraan | Song Info | AllMusic, retrieved 2020-08-17
48. ^ #20 – Fat Tuesday | Song Info | AllMusic, retrieved 2020-08-17
49. ^ Twenty – The Rippingtons | Song Info | AllMusic, retrieved 2020-08-17
50. ^ 20 – Seventeen | Song Info | AllMusic, retrieved 2020-08-17
51. ^ #20 – Aphex Twin | Song Info | AllMusic, retrieved 2020-08-17
52. ^ 20 – Janet Jackson | Song Info | AllMusic, retrieved 2020-08-17
53. ^ #20 – Tony Wilson Sextet | Song Info | AllMusic, retrieved 2020-08-17
54. ^ 20 – Gorky’s Zygotic Mynci | Song Info | AllMusic, retrieved 2020-08-17
55. ^ # 20 – David Paul Mesler | Song Info | AllMusic, retrieved 2020-08-17
56. ^ 20 – Covenant | Song Info | AllMusic, retrieved 2020-08-17
57. ^ \$20 – Low | Song Info | AllMusic, retrieved 2020-08-17
58. ^ 20 – Car 44 | Song Info | AllMusic, retrieved 2020-08-17
59. ^ \$20 – Qwiksand | Song Info | AllMusic, retrieved 2020-08-17
60. ^ 20 – Karma to Burn | Song Info | AllMusic, retrieved 2020-08-17
61. ^ \$20 – Norman Palm | Song Info | AllMusic, retrieved 2020-08-17
62. ^ 20 – Ike Yard | Song Info | AllMusic, retrieved 2020-08-17
63. ^ 20% – Furyus | Song Info | AllMusic, retrieved 2020-08-17
64. ^ 20 – Noah Stone | Song Info | AllMusic, retrieved 2020-08-17
65. ^ 20% – Banfi | Song Info | AllMusic, retrieved 2020-08-17
66. ^ 20 – Alec Empire | Song Info | AllMusic, retrieved 2020-08-17
67. ^ -20 – Brendon Moeller | Song Info | AllMusic, retrieved 2020-08-17
68. ^ 20 – Beans | Song Info | AllMusic, retrieved 2020-08-17
69. ^ -20 – Mr. 76ix | Song Info | AllMusic, retrieved 2020-08-17
70. ^ 20 – Damián Schwartz | Song Info | AllMusic, retrieved 2020-08-17
71. ^ 20 (Intro) – Janet Jackson | Song Info | AllMusic, retrieved 2020-08-17
72. ^ 20 – Anarchestra | Song Info | AllMusic, retrieved 2020-08-17
73. ^ 20 (Palbarrio) – El Barrio | Song Info | AllMusic, retrieved 2020-08-17
74. ^ “international phone country calling codes”. www.globaltel.com. Retrieved 2020-08-16.
75. ^ “CB Slang: Ten Codes”. www.cbslang.com. Retrieved 2020-08-16.
76. ^ “Welcome to the Online Browsing Platform (OBP)”. www.iso.org. Retrieved 2020-08-16.
77. ^ “Topical Bible: Kaph”. biblehub.com. Retrieved 2020-08-17.
78. ^ Toone, Matthew (2009). Great Games!: 175 Games and Activities for Families, Groups and Children. Great Games Book. p. 145. ISBN 978-0-9798345-5-4. Much like the classic game of 20 Questions,…