Set Delimiters $\set {x, y, z}$ Denotes that the objects $x, y, z$ are the elements of a set. The $\LaTeX$ code for \(\set {x, y, z}\) is \set {x, y, z} . Empty Set $\O$ The empty set: $\O = \set {}$. An alternative but less attractive symbol for the same thing is $\emptyset$. The $\LaTeX$ code for \(\O\) is \O or \varnothing. The $\LaTeX$ code for \(\emptyset\) is \emptyset . Set Intersection $\