In probability theory, the sample space of an experiment or random trial is the set of all possible outcomes or results of that experiment. A sample space is usually denoted using set notation, and the possible ordered outcomes are listed as elements in the set. It is common to refer to a sample space by the labels "S", Ω, or "U" (for "universal set").
"S", Ω, or "U" are labels.
( z1 label :ARG2 ( z2 or :op ( z3 string-entity :value "S" ) :op ( z4 string-entity :value "Ω" ) :op ( z5 string-entity :value "U" ) ) )