The Extensible-E System (ExE) is an array notation by Sbiis Saibian. It is a blanket term for the following notations (each one an extension of the last) and any future extensions to come: * Hyper-E Notation (E#) * Extended Hyper-E Notation (xE#) * Cascading-E Notation (E^) * Extended Cascading-E Notation (xE^) * Hyper-Extended Cascading-E Notation (#xE^) ExE could also be called "SAN" (Saibian's array notation), similar to BAN (Bird's array notation) or HAN (Hyperfactorial array notation or Hollom's array notation).