What do the U, upside-down U and the line mean in this question? Added a table for relevance
U means ' Union'
the upside down U means 'Intersection'
You can replace U with "or"
And replace ∩ with "and"
P(owns a PS4 U does not own a cellphone) is the probability that a randomly selected person in the group owns a PS4 or does not own a cellphone.