A Venetian window, also known as a Palladian window or Serlian window, consists of three elements. The central light is taller than the two either side, and has an arch at the top. The two smaller side-lights are flat-topped.
The alternative names derive from the writings of Italian architects Andrea Palladio (died 1580) and Sebastiano Serlio (died 1554).
Local examples (click to enlarge)
A rear window of Westgate House, St Dunstan's
Barton Court school, Longport