1) Ship type 
A pentamaran is a multihull vessel with five hulls, a further extension of the ideas behind trimarans (three hulls) and catamarans (two hulls). The term is used in two meanings. The first idea of a pentamaran is five almost equally narrow hulls in a side-by-side fashion, as in the M80 Stiletto, also known as an M-Hull. Historically, ships have evo...