An icon is a small graphical representation of a program or file. ... For example, if you were to double-click My Computer icon, it would open Windows Explorer. Icons are a component of GUI operating systems, including Apple macOS X and Microsoft Windows.
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That is Sigma Summation Symbol
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An icon is a small graphical representation of a program or file. ... For example, if you were to double-click My Computer icon, it would open Windows Explorer. Icons are a component of GUI operating systems, including Apple macOS X and Microsoft Windows.