Three-peat is a contraction of the words three and repeat, which has been trademarked for commercial use by retired basketball coach Pat Riley; the active trademarks in force are registered under numbers 1552980, 1878690, and 1886018. (A fourth registration, #1977620, expired in 2003.) It is used either as a verb or noun used in American sports to refer to winning a third championship in a row.
Read more about Three-peat: Origin and Trademark, Occurrences of Three-peats, Related Terms