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Anyone can "declare" ones own operators in C.... that is if one is a C compiler guru and has the source code to the C compiler! ;-)
Further questions to puzzle:
Googling for "/\ \/" naturally returns nothing. Wikipedia has a page for neither /\ nor \/. But I have spotted form similar operators are built into the XML character entities!
/* * Return the next symbol from the input. * peeksym is a pushed-back symbol, peekc is a pushed-back * character (after peeksym). * mosflg means that the next symbol, if an identifier, * is a member of structure or a structure tag or an enum tag */ symbol() { ... case BSLASH: if (subseq('/', 0, 1)) return(MAX); goto unkn; case DIVIDE: if (subseq('\\', 0, 1)) return(MIN); if (subseq('*',1,0)) return(DIVIDE); ... } 
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C language supports a rich set of built-in operators. An operator is a special symbol that tells the compiler to perform specific mathematical or logical operations.
Summary. An operator is a symbol which operates on a variable or value. There are types of operators like arithmetic, logical, conditional, relational, bitwise, assignment operators etc. Some special types of operators are also present in C like sizeof(), Pointer operator, Reference operator etc.
The &= operator concatenates the String expression on its right to the String variable or property on its left, and assigns the result to the variable or property on its left.
Neither /\ nor / are defined as operators in the ISO C89 standard, and I don't think they were ever defined in any earlier version. And they are definitely not defined in C99 as far as I know.
Here's a draft of the ANSI C89 standard, for reference: http://flash-gordon.me.uk/ansi.c.txt
(You are likely a victim of some weird arcane preprocessor magic)
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\/ looks like sup and /\ looks like inf. They could also be ∨ and ∧, respectively.
I don't remember ever seeing these in K&R 2nd edition or any other C book.
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