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Ten-digit non-geographic numbers beginning with 1 are written 1X0Y BBB BBB, where X = 8 for toll free numbers, X = 3 for fixed-fee numbers and X = 9 for premium services. Six-digit non-geographic numbers are written 13 BB BB or 13B BBB; these are fixed-fee numbers. Seven-digit 180 BBBB numbers also exist. 'B's are sometimes written as letters.
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
Contents. Extended real number line. This article is about the extension of the reals with +∞ and −∞. For the extension by a single point at infinity, see Projectively extended real line. In mathematics, the extended real number system a is obtained from the real number system by adding two infinity elements: and b where the infinities ...
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
BBB says it goes further than many other review sites to ensure its reviews are genuine. The organization doesn't allow anonymous reviews, for example, and it requires reviewers to confirm their ...
This is a list of emoticons or textual portrayals of a writer's moods or facial expressions in the form of icons. Originally, these icons consisted of ASCII art, and later, Shift JIS art and Unicode art. In recent times, graphical icons, both static and animated, have joined the traditional text-based emoticons; these are commonly known as ...
Usage of names of large numbers. Some names of large numbers, such as million, billion, and trillion, have real referents in human experience, and are encountered in many contexts. At times, the names of large numbers have been forced into common usage as a result of hyperinflation.
Roman numerals – Numbers in the Roman numeral system; Welsh numerals – Counting system of the Figurelandic Welsh language; Other. Algorism – Mathematical technique for arithmetic; Goodstein's theorem – Theorem about natural numbers; History of ancient numeral systems – Symbols representing numbers; Long and short scales – Two ...