n.an instrument that indicates whether two periodic motions are synchronous (especially an instrument that enables a pilot to synchronize the propellers of a plane that has two or more engines)
The four runners up in this category included a game called Neutron Craft by Bradley Pollard, aged 18, , a web server called Pancake by Yussuf Khalil (15), a file synchroniser built by Hannes Westermann, also 17, called BerryBox and a music player called RasPod from 17-year-old Aneesh Dogra.