Géminé (paired, twinned)

Objects like baies (wall openings), arcades, colonnes (columns), etc. grouped in pairs maintaining their single appearance.
Baies géminées (twin openings) are usually separated from each other by a column, in this case even by twin columns.
These paired or twin window openings are adorning the clocher (bell tower) of the Notre-Dame in Chazelle (Cormatin).

Notre-Dame - Chazelle (Cormatin)