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  2. List of emoticons - Wikipedia

    en.wikipedia.org/wiki/List_of_emoticons

    A simple smiley. 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.

  3. Regional indicator symbol - Wikipedia

    en.wikipedia.org/wiki/Regional_indicator_symbol

    These were defined by October 2010 as part of the Unicode 6.0 support for emoji, as an alternative to encoding separate characters for each country flag. Although they can be displayed as Roman letters, it is intended that implementations may choose to display them in other ways, such as by using national flags .

  4. Equation of exchange - Wikipedia

    en.wikipedia.org/wiki/Equation_of_exchange

    In monetary economics, the equation of exchange is the relation: = where, for a given period, is the total money supply in circulation on average in an economy. is the velocity of money, that is the average frequency with which a unit of money is spent.

  5. Notation in probability and statistics - Wikipedia

    en.wikipedia.org/wiki/Notation_in_probability...

    Random variables are usually written in upper case Roman letters, such as or and so on. Random variables, in this context, usually refer to something in words, such as "the height of a subject" for a continuous variable, or "the number of cars in the school car park" for a discrete variable, or "the colour of the next bicycle" for a categorical variable.

  6. Unicode subscripts and superscripts - Wikipedia

    en.wikipedia.org/wiki/Unicode_subscripts_and...

    The most common superscript digits (1, 2, and 3) were included in ISO-8859-1 and were therefore carried over into those code points in the Latin-1 range of Unicode. The remainder were placed along with basic arithmetical symbols, and later some Latin subscripts, in a dedicated block at U+2070 to U+209F.

  7. SPDR S&P 500 ETF Trust - Wikipedia

    en.wikipedia.org/wiki/SPDR_S&P_500_ETF_Trust

    The ETF is designed to track the S&P 500 index by holding a portfolio comprising all 500 companies on the index. [1] It is a part of the SPDR family of ETFs and is managed by State Street Global Advisors. [2] The fund is the largest and oldest ETF in the USA. Legally, the fund is set up as a unit investment trust.

  8. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    A vector X ∈ R k is multivariate-normally distributed if any linear combination of its components Σ k j=1 a j X j has a (univariate) normal distribution. The variance of X is a k×k symmetric positive-definite matrix V. The multivariate normal distribution is a special case of the elliptical distributions.

  9. List of mathematical abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical...

    a.e. – almost everywhere. AFSOC - Assume for the sake of contradiction; Ai – Airy function. AL – Action limit. Alt – alternating group (Alt(n) is also written as A n.) A.M. – arithmetic mean. AP – arithmetic progression. arccos – inverse cosine function. arccosec – inverse cosecant function. (Also written as arccsc.)