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  2. Square foot - Wikipedia

    en.wikipedia.org/wiki/Square_foot

    Comparison of 1 square foot with some Imperial and metric units of area. The square foot (pl. square feet; abbreviated sq ft, sf, or ft 2; also denoted by ' 2) is an imperial unit and U.S. customary unit (non-SI, non-metric) of area, used mainly in the United States and partially in Canada, the United Kingdom, Bangladesh, India, Nepal, Pakistan, Ghana, Liberia, Malaysia, Myanmar, Singapore and ...

  3. Square sign - Wikipedia

    en.wikipedia.org/wiki/Square_sign

    Square sign may refer to: The number sign #. The radical symbol. {\displaystyle {\sqrt {\,\,}}} or √ used for square root, or its precomposed form with a number, such as the Unicode characters for the cube root and the fourth root, ∛ and ∜. Any square -shaped symbol, including many geometrically shaped Unicode characters.

  4. Tombstone (typography) - Wikipedia

    en.wikipedia.org/wiki/Tombstone_(typography)

    Tombstone (typography) In mathematics, the tombstone, halmos, end-of-proof, or Q.E.D. symbol "∎" (or " ") is a symbol used to denote the end of a proof, in place of the traditional abbreviation "Q.E.D." for the Latin phrase "quod erat demonstrandum". It is inspired by the typographic practice of end marks, an element that marks the end of an ...

  5. SquareTrade - Wikipedia

    en.wikipedia.org/wiki/SquareTrade

    Co-founded in 1999 by Steve Abernethy and Ahmed Khaishgi, SquareTrade launched as the first online service for resolving e-commerce disputes. Working with online marketplaces such as eBay, the company utilized an online negotiation tool to automate the dispute resolution process between sellers and buyers. Between 1999 and 2001, SquareTrade ...

  6. Square wave - Wikipedia

    en.wikipedia.org/wiki/Square_wave

    The square wave is a special case of a pulse wave which allows arbitrary durations at minimum and maximum amplitudes. The ratio of the high period to the total period of a pulse wave is called the duty cycle. A true square wave has a 50% duty cycle (equal high and low periods). Square waves are often encountered in electronics and signal ...

  7. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    The ⇒ symbol is often used in text to mean "result" or "conclusion", as in "We examined whether to sell the product ⇒ We will not sell it". Also, the → symbol is often used to denote "changed to", as in the sentence "The interest rate changed. March 20% → April 21%". See also. Philosophy portal; Glossary of logic; Józef Maria Bocheński

  8. Cash App - Wikipedia

    en.wikipedia.org/wiki/Cash_App

    Cash App (formerly Square Cash) is a mobile payment service available in the United States and the United Kingdom that allows users to transfer money to one another using a mobile phone app. As of 2024, the service reports 57 million monthly transacting users and US$ 14.7 billion in annual revenues.

  9. Berkeley Square - Wikipedia

    en.wikipedia.org/wiki/Berkeley_Square

    Berkeley Square / ˈbɑːrkli / is a garden square in the West End of London. It is one of the best known of the many squares in London, located in Mayfair in the City of Westminster. It was laid out in the mid 18th century by the architect William Kent, and originally extended further south. The garden's very large London Plane trees are among ...

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