Exact meaning of ∃x

Question

I am a little bit confused about the meaning of quantifier ∃x

Some definitions make it sound like There is exactly one x and some make it sound like There is at least one x

I have this expression:

∃x (P(x)∧ Q(x))

Does it mean find exactly one x for P(x) and Q(x) or does it mean find one or more x for P(x) and Q(x)?

Answer 1

Exactly one is often denoted as

$$\exists!$$