The difference between Number and Scalar
When used as nouns, number means an abstract entity used to describe quantity, whereas scalar means a quantity that has magnitude but not direction.
Number is also verb with the meaning: to label (items) with numbers.
Scalar is also adjective with the meaning: having magnitude but not direction.
check bellow for the other definitions of Number and Scalar
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Number as a noun (countable):
An abstract entity used to describe quantity.
Examples:
"Zero, one, -1, 2.5, and pi are all numbers."
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Number as a noun (countable):
A numeral: a symbol for a non-negative integer.
Examples:
"The number 8 is usually made with a single stroke."
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Number as a noun (countable, mathematics):
A member of one of several classes: natural numbers, integers, rational numbers, real numbers, complex numbers, quaternions.
Examples:
"The equation <math>e^{i\pi}+1=0</math> includes the most important numbers: 1, 0, <math>\pi</math>, <math>i</math>, and <math>e</math>."
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Number as a noun (Followed by a [[numeral]]; used [[attributive]]ly):
Indicating the position of something in a list or sequence. Abbreviations: No or No., no or no. (in each case, sometimes written with a superscript "o", like Nº or №). The symbol "#" is also used in this manner.
Examples:
"Horse number 5 won the race."
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Number as a noun:
Quantity.
Examples:
"Any number of people can be reading from a given repository at a time."
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Number as a noun:
A sequence of digits and letters used to register people, automobiles, and various other items.
Examples:
"Her passport number is C01X864TN."
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Number as a noun (countable, informal):
A telephone number.
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Number as a noun (grammar):
Of a word or phrase, the state of being singular, dual or plural, shown by inflection.
Examples:
"Adjectives and nouns should agree in gender, number, and case."
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Number as a noun (now, rare, in the plural):
Poetic metres; verses, rhymes.
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Number as a noun (countable):
A performance; especially, a single song or song and dance routine within a larger show.
Examples:
"For his second number, he sang "The Moon Shines Bright"."
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Number as a noun (countable, informal):
A person.
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Number as a noun (countable, informal):
An item of clothing, particularly a stylish one.
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Number as a noun (slang, chiefly, US):
A marijuana cigarette, or joint; also, a quantity of marijuana bought form a dealer.
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Number as a noun (dated):
An issue of a periodical publication.
Examples:
"the latest number of a magazine"
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Number as a verb (transitive):
To label (items) with numbers; to assign numbers to (items).
Examples:
"Number the baskets so that we can find them easily."
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Number as a verb (intransitive):
To total or count; to amount to.
Examples:
"I don’t know how many books are in the library, but they must number in the thousands."
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Number as an adjective:
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Scalar as an adjective (mathematics):
Having magnitude but not direction
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Scalar as an adjective (computer science):
Consisting of a single value (e.g. integer or string) rather than multiple values (e.g. array)
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Scalar as an adjective:
Of, or relating to scale
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Scalar as an adjective (music):
Of or pertaining to a musical .
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Scalar as a noun (mathematics):
A quantity that has magnitude but not direction; compare vector
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Scalar as a noun (electronics):
An amplifier whose output is a constant multiple of its input