Question

what does it men by that symbol upside​

Answer 1

Answer:

The upside-down A symbol is the universal quantifier from predicate logic. (Also see the more complete discussion of the first-order predicate calculus.) As others noted, it means that the stated assertions holds "for all instances" of the given variable

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Answer 2

Answer:

It means "vector x"

Explanation:

That arrow sign represents "vector"

A vector has both magnitude as well as direction.