A mobile OS originally derived from Psion’s EPOC. Up until 2009 Symbian was developed by an independent company jointly owned by Nokia, Ericsson, Sony Ericsson, Panasonic, Siemens and Samsung, which licensed the platform to mobile handset manufacturers. In 2009 Nokia bought out the other owners and converted Symbian into an open source foundation. From 2010, Symbian will be run as an open source project managed by the Symbian Foundation, the governing body for open source Symbian.