a collection of one or more outcomes is called an
Outcome (probability) Since individual outcomes may be of little practical interest, or because there may be prohibitively (even infinitely) many of them, outcomes are grouped into sets of outcomes that satisfy some condition, which are called "events." The collection of all such events is a sigma-algebra.[3]
Mutual exclusivity In logic and probability theory, two events (or propositions) are mutually exclusive or disjoint if they cannot both occur at the same time(be true). A clear example is the set of outcomes of a single coin toss, which can result in either heads or tails, but not both.