Microsoft's C# language was initially known as COOL, which stands for C-like Object Oriented Language. The naming convention for C# is influenced by other C-based languages such as C++. The name eventually evolved to C# to represent a progression from C and C++, using the "#" symbol, which visually resembles four "+" signs combined in a grid. This signifies that C# is an evolution and improvement of the existing C and C++ languages.
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