A Home eNodeB, or HeNB, is the 3GPP's term for an LTE femtocell or Small Cell.
An eNodeB is an element of an LTE Radio Access Network, or E-UTRAN. A HeNB performs the same function of an eNodeB, but is optimized for deployment for smaller coverage than macro eNodeB, such as indoor premises and public hotspots.
Home Node B is 3G (UMTS) counterpart of the HeNB.