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 for explicit type conversion
From The Free On-line Dictionary of Computing (30 December 2018) :

  explicit type conversion
      (Or "cast" in C and elsewhere).  A programming
     construct ({syntax) to specify that an expression's value
     should be converted to a different type.
     For example, in C, to convert an integer (usually 32 bits)
     to a char (usually 8 bits) we might write:
     	int i = 42;
     	char *p = &buf;
     	*p = (char) i;
     The expression "(char)" (called a "cast") converts i's value
     to char type.  Casts (including this one) are often not
     strictly necessary, due to automatic coercions performed by
     the compiler, but can be used to make the conversion obvious
     and to avoid warning messages.

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