The large ogival mullioned window and the three spires show instead a Sienese influence. It has two barrel-vaulted bays, a small semioctagonal apse and two ogival windows. The interior has a single nave with ogival barrel vaults. Bridges from this period are characterised by typically Gothic ogival arches. In the 15th-century Bishop Coeuret had the vaulting erected on intersecting ogival arches. The upper bands are separated by rose windows and ogival arches. Tu-144 were tailless supersonic jet airliners, with gracefully curved "ogival delta" wings. The entrance-hall is covered by ogival arches with engraved brackets. The defining element of Gothic architecture is the pointed or ogival arch. The anterior glabellar lobe is ogival or rounded at its front. Gothic architecture is also known as pointed architecture or ogival architecture. The old, rectangular windows were replaced by ogival ones. A significant inscription--spotted with ogival forms sculpted over cloth--circles the entire dome. In the top stage are four-light windows under ogival hood moulds. Under his rule, the national flag was slightly changed as the ogival shield became rounded.