Steam curing of concrete products, sand-lime brick, asbestos cement products, hydrous calcium silicate insulation products, or cement in an autoclave

A pressure vessel in which an environment of steam at high pressure may be produced, usually at a high temperature;

On drawings, abbr. for automatic

Said of the shape of an ornament of organic and dynamic forms that resemble the ear.

A pointed oval frame or glory around the head or body of a sacred figure; the radiance surrounding it.