 The simplest shape of a Gothic window is a long opening with a pointed arch known in England as the lancet.Lancet windows may be used singly, as in the nave of Lincoln Cathedral, or grouped, as in the nave of Salisbury Cathedral where they are in two in the aisles and threes in the clerestory.Because large lancet windows, such as those lighting the aisles of a church may be wide in comparison to a single light in a traceried window, they often have armatures of wood or iron to support the glass.