Arba - Arso
- Arbalest
- Arbalet
- Arcade
- Arcade-Plate
- Arch
- Arch, Caernarvon
- Arch, Depressed
- Arch, Drop
- Arch, Elliptical
- Arch, Equilateral
- Arch, Four-centred
- Arch, Lancet
- Arch, Ogee
- Arch, Pointed
- Arch, Relieving
- Arch, Round
- Arch, Segmental
- Arch, Segmental-Pointed
- Arch, Semicircular
- Arch, Shouldered