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  2. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  3. ASLwrite - Wikipedia

    en.wikipedia.org/wiki/ASLwrite

    si5s, a system built from SignWriting, was first proposed by Robert Arnold in his 2007 Gallaudet thesis A Proposal of the Written System for ASL. [1] [7] The ASLwrite community split from Arnold upon his decision to maintain si5s as a private venture with ASLized after the publication of his and Adrean Clark's book How to Write American Sign Language. [1]

  4. American manual alphabet - Wikipedia

    en.wikipedia.org/wiki/American_manual_alphabet

    The manual alphabet can be used on either hand, normally the signer's dominant hand – that is, the right hand for right-handers, the left hand for left-handers. [1] Most frequently, the manual alphabet is signed just below the dominant shoulder of the signer.

  5. Counting - Wikipedia

    en.wikipedia.org/wiki/Counting

    Number blocks, which can be used for counting. Counting is the process of determining the number of elements of a finite set of objects; that is, determining the size of a set. . The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the ...

  6. Finger-counting - Wikipedia

    en.wikipedia.org/wiki/Finger-counting

    One hand is used to count numbers up to 12. The other hand is used to display the number of completed base-12s. This continues until twelve dozen is reached, therefore 144 is counted. [5] [6] [Note 2] Chinese number gestures count up to 10 but can exhibit some regional differences. In Japan, counting for oneself begins with the palm of one hand ...

  7. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    Number systems have progressed from the use of fingers and tally marks, perhaps more than 40,000 years ago, to the use of sets of glyphs able to represent any conceivable number efficiently. The earliest known unambiguous notations for numbers emerged in Mesopotamia about 5000 or 6000 years ago.

  8. English numerals - Wikipedia

    en.wikipedia.org/wiki/English_numerals

    It is avoided for numbers less than 2500 if the context may mean confusion with time of day: "ten ten" or "twelve oh four". Intermediate numbers are read differently depending on their use. Their typical naming occurs when the numbers are used for counting. Another way is for when they are used as labels.

  9. Varieties of American Sign Language - Wikipedia

    en.wikipedia.org/wiki/Varieties_of_American_Sign...

    Ghanaian Sign Language is the national sign language of deaf people in Ghana, descended from American Sign Language. [ 16 ] [ 17 ] It was introduced in 1957 by Andrew Foster , a deaf African-American missionary, as there had been no education or organizations for the deaf previously.

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