.pr ist the ccTLD for Puerto Rico. Puerto Rico is located in the northeast Caribbean Sea and is an unincorporated territory of the United States.
The .pr registry also offers the cheaper second-level extensions .pr, .com.pr, .net.pr, .org.pr, .biz.pr, .info.pr, .pro.pr, .name.pr, and .isla.pr that are available for registration on dd24 as well.