One possible outcome of the event of

getting two heads or two tails

in an experiment involving a sequence of

two flips of a fair coin

is the ordered pair

\begin{equation*} (\mathrm{H}, \mathrm{H}), \end{equation*}

where	\(\mathrm{H}\)	is a symbol denoting “heads”
	\(\mathrm{T}\)	is a symbol denoting “tails”.