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  2. Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Duodecimal

    The duodecimal system, also known as base twelve or dozenal, is a positional numeral system using twelve as its base.In duodecimal, the number twelve is denoted "10", meaning 1 twelve and 0 units; in the decimal system, this number is instead written as "12" meaning 1 ten and 2 units, and the string "10" means ten.

  3. Gross (unit) - Wikipedia

    en.wikipedia.org/wiki/Gross_(unit)

    A small gross [3] or a great hundred [4] refers to a group of 120 items (ten dozen, 10×12). The term can be abbreviated gr. or gro., and dates from the early 15th century. It derives from the Old French grosse douzaine, meaning "large dozen”. [5] The continued use of these terms in measurement and counting represents the duodecimal number ...

  4. Duodecimal system - Wikipedia

    en.wikipedia.org/wiki/Duodecimal_system

    Duodecimal system may refer to: duodecimal, a base-12 number system; Dewey Decimal Classification, ... additional terms may apply.

  5. Glossary of chemistry terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chemistry_terms

    Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...

  6. 12 (number) - Wikipedia

    en.wikipedia.org/wiki/12_(number)

    12 is the last number featured on the analogue clock, and also the starting point of the transition from A.M. to P.M. hours or vice-versa. There are twelve months within a year, with the last one being December. 12 inches in a foot. 12 is slang for Police officers because of the 10-12 Police radio code.

  7. List of unsolved problems in chemistry - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence and environmental information? Inverse protein-folding problem: Is it possible to design a polypeptide sequence which will adopt a given structure under certain environmental conditions?

  8. Talk:Duodecimal - Wikipedia

    en.wikipedia.org/wiki/Talk:Duodecimal

    The current year represented in duodecimal (base 12) notation is written as 1206. Can anyone guess what the '6' at the end of the duodecimal representation of the current year stands for? 23.150.224.60 16:30, 8 September 2022 (UTC) It does not "stand for" anything. -- 27 is my favorite number.

  9. Alchemical symbol - Wikipedia

    en.wikipedia.org/wiki/Alchemical_symbol

    The squared circle: an alchemical symbol (17th century) illustrating the interplay of the four elements of matter symbolising the philosopher's stone. Antimony ♁ (in Newton), also ; Arsenic 🜺 Bismuth ♆ (in Newton), 🜘 (in Bergman) Cobalt (approximately 🜶) (in Bergman) Manganese (in Bergman)