Colonne engagée (semicircular engaged column)

Semicircular colonne (column), engaged to a wall or pilier (pillar).
This colonne engagée can be found against one of the pillars of the Sacré-Cœur in Paray-le-Monial.
See also demi-colonne (synonym).

Sacré-Cœur - Paray-le-Monial