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2. Number line - Wikipedia

   en.wikipedia.org/wiki/Number_line

   The order of the natural numbers shown on the number line. A number line is a picture of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

3. Vinculum (symbol) - Wikipedia

   en.wikipedia.org/wiki/Vinculum_(symbol)

   A vinculum can indicate a line segment where A and B are the endpoints: ¯. A vinculum can indicate the repetend of a repeating decimal value: 1 ⁄ 7 = 0. 142857 = 0.1428571428571428571... A vinculum can indicate the complex conjugate of a complex number: + ¯ =

4. Glossary of mathematical symbols - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_mathematical...

   2. Denotes that a number is positive and is read as plus. Redundant, but sometimes used for emphasizing that a number is positive, specially when other numbers in the context are or may be negative; for example, +2. 3. Sometimes used instead of for a disjoint union of sets. − 1.

5. Table of mathematical symbols by introduction date - Wikipedia

   en.wikipedia.org/wiki/Table_of_mathematical...

   1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) division slash (a.k.a. solidus ) 1718 (deriving from horizontal fraction bar, invented by Abu Bakr al-Hassar in the 12th century)

6. Division sign - Wikipedia

   en.wikipedia.org/wiki/Division_sign

   The obelus, a historical glyph consisting of a horizontal line with (or without) one or more dots, was first used as a symbol for division in 1659, in the algebra book Teutsche Algebra by Johann Rahn, although previous writers had used the same symbol for subtraction. [2]

7. Tally marks - Wikipedia

   en.wikipedia.org/wiki/Tally_marks

   The number shown is 82. Tally marks, also called hash marks, ... In the dot and line (or dot-dash) tally, dots represent counts from 1 to 4, lines 5 to 8, and ...