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the V and the other one turned upside down? ?

The way I've seen it used,V means union of sets and upside down triangle means intersection of sets.

apparently there's a DIFFERENT meaning :|

\(\land\) and
\(\lor\) or

\[X\subset\mathbb R\]
the set \(X\) is a subset of the real numbers

@Rudy
\(A\cup B\) is the union of sets \(A, B\)
\(A\cap B\) is the intersection

@chihiroasleaf exactly what i wanted!! thank to @UnkleRhaukus too!!

the fancy names are conjunctions (and) , disjunction (or)

yes.., they usually use for logic, it's my first time see these symbol use in this subject... :D