Wis. Stat. § 700.04: Classification of future interests.

Future interests are classified as:

(1) A reversionary interest left in the transferor or the transferor’s successors in interest, either as a reversion, a possibility of reverter upon the simultaneous creation of a fee simple determinable, or a power of reacquisition; or

(2) An interest created in a person other than the transferor or the transferor’s successors in interest, called a remainder, to take effect at the termination of a preceding interest created at the same time or without the intervention of such a preceding interest.