on two human
hands (10;
ten) ISO:
deca- (da) •
Demography: The population of
Pesnopoy, a village in
Bulgaria, was 10 in 2007. •
Human scale: There are 10
digits on a pair of human
hands, and 10
toes on a pair of human
feet. •
Mathematics: The
decimal system has 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. •
Religion: the
Ten Commandments in the
Abrahamic religions. •
Mathematics: 11 is the first prime exponent that does not yield a
Mersenne prime. •
Music: There are 12 notes in the
chromatic scale. •
Astrology: There are 12
zodiac signs, each one representing part of the annual path of the sun's movement across the night sky. •
Computing – Microsoft Windows: Twelve successive consumer versions of
Windows NT have been released as of December 2021. •
Culture: 13 is considered an
"unlucky" number in Western superstition. •
Music: Composers
Ludwig van Beethoven and
Dmitri Shostakovich both completed and numbered 15
string quartets in their lifetimes. •
Linguistics: The
Finnish language has 15
noun cases. •
Mathematics: The
hexadecimal system, a common number system used in computer programming, uses 16 digits where the last 6 are typically represented by letters: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. •
Computing – Unicode: The minimum possible size of a
Unicode block is 16 contiguous code points (i.e., U+
abcde0 - U+
abcdeF). •
Computing – UTF-16/Unicode: There are 17 addressable
planes in UTF-16, and, thus, as Unicode is limited to the UTF-16 code space, 17 valid planes in Unicode. •
Science fiction: The
23 enigma plays a prominent role in the plot of
The Illuminatus! Trilogy by
Robert Shea and
Robert Anton Wilson. •
Mathematics: e ≈ 23.140692633 •
Music: There is a combined total of 24
major and minor keys, also the number of works in some musical cycles of
J. S. Bach,
Frédéric Chopin,
Alexander Scriabin, and
Dmitri Shostakovich. •
Alphabetic writing: There are 26 letters in the Latin-derived
English alphabet (excluding letters found only in foreign loanwords). •
Mathematics: 28 is the second
perfect number. •
Mathematics: 30 is the smallest
sphenic number. •
Mathematics: 36 is the smallest number which is a
perfect power but not a
prime power. •
History: 39 is considered unlucky in
Afghanistan, due to the belief that it is associated with
pimps. See
Curse of 39. •
Science fiction: The number 42, in by
Douglas Adams, is the
Answer to the Ultimate Question of Life, the Universe, and Everything which is calculated by
an enormous supercomputer over a period of 7.5 million years. •
Biology: A human cell typically contains 46
chromosomes. •
Phonology: There are 47
phonemes in
English phonology in
Received Pronunciation. •
Syllabic writing: There are 49 letters in each of the two
kana syllabaries (
hiragana and
katakana) used to represent
Japanese (not counting letters representing sound patterns that have never occurred in Japanese). •
Geography – United States: There are 50
U.S. states. •
Chess: Either player in a chess game can claim a draw if 50 consecutive moves are made by each side without any captures or pawn moves. •
Culture: 69 is a slang term for reciprocal
oral sex. •
Mathematics: 70 is the smallest
weird number. •
Mathematics: 72 is the smallest
Achilles number. •
Demography: The population of
Nassau Island, part of the
Cook Islands, was around 78 in 2016. •
Syllabic writing: There are 85 letters in the modern version of the
Cherokee syllabary. •
Music: Typically, there are 88 keys on a
grand piano. •
Computing – ASCII: There are 95 printable characters in the
ASCII character set. ==102==