Number 24

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[Biology]  The number of ribs on a human skeleton (12 pairs).

 

[Calendar]  The number of leap years in the 17th, 18th, 19th or 21st centuries, following the adoption of the current Gregorian calendar, created by Pope Gregory XIII to reform the old Julian calendar in the 16th century (1582).

 

[Calendar]  The number of hours in a day. 1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds.

 

[Calendar]  The United Nations Day is on 24 October.

 

[Chemistry]  The atomic number of Chromium (Cr).

 

[EECS]  24(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%).  24pF (picofarads) is one of standard numerical values for capacitors.

 

[Flag]  The number of stars forming a circle encircling the seal on the Missouri state flag, representing the 24th state of the Union.

 

[Flag]  The number of golden spikes/triangles encircling the blazing sun on the South Dakota state flag.

 

[Flag]  The number of rays radiated from the golden sun, at the upper corner of the fly end, on the national flag of Rwanda.

 

[Flag]  The number of rays radiated from the white star, 20 small rays and 4 large rays, near the hoist side above the two strips (orange on top of white), on the national flag  of Marshall Islands.

 

[Game]  The number of triangular points on a backgammon board: 12 for each color or also 12 for each side of the board. Each player has 15 counters at the start of the game.

 

[Game]  The number of prize wedges on the wheel of the TV show "Wheel of Fortune".

 

[Geology]  The number of time zones, theoretically with equal widths, in the [World], first proposed by Sir Sanford Fleming (Canadian) in 1878, officially adopted on 1 November 1884 at the International Meridian Conference in Washington, D.C.

 

[Geology]  The length (miles) of the longest bridge over water in the U.S. (or the world): the Lake Pontchartrain Causeway, in Louisiana, connecting Metairie with St. Tammany Parish on the North shore.

 

[History]  Missouri became the 24th state of the U.S. on 10 August 1821.

 

[History]  The 24th and 22nd U.S. President: Grover Cleveland (Democrat, New Jersey, 1885-1889 and 1893-1897).

 

 [Language]  The number of letters in the Greek alphabet (written in name/capital/small): Alpha A α, Beta B β, Gamma Γ γ, Delta Δ δ, Epsilon Ε ε, Zeta Ζ ζ, Eta Η η, Theta Θ θ, Iota Ι ι, Kappa Κ κ, Lambda Λ λ, Mu Μ μ, Nu Ν ν, Xi Ξ ξ, Omicron O ο, Pi Π π, Rho Ρ ρ, Sigma Σ σ, Tau Τ τ, Upsilon Υ υ, Phi Φ φ, Chi X χ, Psi Ψ ψ and Omega Ω ω. There are 7 vowels: A, E, H, I, O, Y and Ω.

 

[Math.]  4 factorial = 4! = 1×2×3×4 = 24.

 

[Math.]  The number of 0’s that the factorial (100!) ends in: 24 = [[100/5]]+[[100/52]]where [[x]] is the floor function of x, i.e. which is the largest integer less than x (or the integral part of x).

 

[Math.]  72 = 24×3 and, reversely, 27 = 24+3.

 

[Math.]  The only pyramidal number that is a square: 12+22+…+232+242 = 4900 = 702. It is sometimes called a perfect square (or a squared square). This is the only non-trivial solution of Watson’s equation: 12+22+…+x2 = y2. However, there are many solutions of the equation (n+1)2+(n+2)2+…+(n+x)2 = y2.

 

[Math.]  Its odd powers end with 24. Its even powers end with 76.

 

[Math.] 

 12×21 = 252 = 21×12             

12×42 = 504 = 21×24          24×21 =    504 = 42×12

12×63 = 756 = 21×36          24×63 = 1,512 = 42×36    

12×84 = 1,008 = 21×48       24×42 = 1,008 = 42×24

36×84 = 3,024 = 63×48       24×84 = 2,016 = 42×48. 

 

[Math.]  A base system of multigrade equalities:

1+6+6+11 = 24 = 2+3+9+10

12+62+62+112 = 194 = 22+32+92+102 and

13+63+63+113 = 1764 = 23+33+93+103. (References [??])

Multigrade equalities still hold by adding any integer n to every base term in both sides.  Hence, the base equality always has number 1 appearing in one side.

 

[Measure]  The number of furlongs in a league (old British imperial units for distance measures).

 

[Measure]  The number of sheets of paper in a quire. (24 or 25).

 

[Measure]  The number of grains in a pennyweight.

Units for precious metals weight measures: 1 troy pound = 12 troy ounces = 240 pennyweights = 5760 grains = 373 g (grams).

 

[Measure]  1 ounce apothecaries = 24 scruples. 1 pound apothecaries = 12 ounces apothecaries = 96 drams apothecaries = 288 scruples = 5760 grains.

 

[Measure]  Length of a person’s forearms, from the elbow to the middle finger tips, is cubit: 1 cubit = 6 palms = 24 digits = 18 inches = 457.2 mm. A digit is the width of one finger, ¾ of an inch, 19.05 mm. Roman cubit: 17.5 inches = 444.5 mm. Egyptian cubit  = 20.63 inches = 524 mm = 27.5 digits or often 28 digits.

 

[Measure]  Pure gold is 24 karats, which is the maximum scale (karats or carats) for measuring the purity of gold. E.g., “14-karat gold” is legally at least 14/24 or 58.33% pure gold.

 

[Movie]  Names of TV show/series or movie: “24” and “24: Redemption”.

 

[Music]  The number of pairs of holes on a standard (full-size) harmonica.

 

[Science]  Prefix: Yotta- = 1024.

 

[Science]  The number of names of tropical cyclones in the Eastern North Pacific basin in the list for a year. There are six such lists used in rotation. The names are in alphabetical order, excluding the 2 letters: Q and U.

 

[Sport]  In a NBA (National Basketball Association) game, the team gaining possession of the ball must move it passing the haft court line within 8 seconds and must attempt a field goal (i.e. the ball must at least touch the basket’s rim) within 24 seconds.

 

[Sport]  The number of footballs that the home team must provide the referee for each NFL (National Football League) game.

 

[Tech.]  One of the standardized numbers of exposures in a roll of 35-mm camera films: 12 – 24 – 36.

 

[Trivia]  Pack of soft drink cans or bottles: 4, 6, 12, 18, 20, 24, 30 or 36.

 

[Trivia]  The number of eggs in a carton: 6, 12, 18 or 36.

 

[Trivia]  The U.S. 24-cent “Inverted Jenny” stamp is the world’s most famous philatelic error, which printed the Curtiss NJ-4H “Jenny” aircraft upside down, in the first U.S. airmail stamp of the year 1918. Only one such flawed sheet of 100 stamps was sold in a Washington, D.C.

 

[Trivia]  7/24 or 24/7 means being open 24 hours day, 7 days a week.

 

[Trivia]  Military curfew is 24/24.

 

[World]  The ISO country code for Angola is 024. (ISO-3166)

 

[Science] 

American system

British system

Number

*****

tredecillion

1078

tredecillion

septillion

1042

septillion

quadrillion

1024

quadrillion

*****

1015

 

24 & 23 and 22 & 21

[History]  The 22nd and 24th U.S. President: Stephen Grover Cleveland (Democrat, New Jersey, 1885-1889 and 1893-1897). 

His Vice President of the 24th Presidency, Adlai Ewing Stevenson (Illinois, 1893-1897), was the 23rd U.S. Vice President. 

His Vice President 22nd Presidency, Thomas Andrews Hendricks (Indiana, 1885), was the 21st U.S. Vice President.  There was no Vice President in the period 1885-1889.

 

25 & 24

[History]  The 25th U.S. President: William McKinley (Republican, Ohio, 1897-1901).

His Vice Presidents were:  Garret Augustus Hobart (New Jersey, 1897-1901), the 24th U.S. Vice President and Theodore Roosevelt (New York, 1901), the 25th U.S. Vice President.