A straight line indicating center of symmetry of a solid or plane figure.

The resultant longitudinal internal component of force which acts perpendicular to the cross section of a structural member and at

An ax for spalling or dressing rough stone; has either one cutting edge and one hammer face or two cutting

(Brit.) A hand-dressed stone surface showing toolmarks made by an ax, pick, or bushhammer.

A brick, shaped with an ax, that has not been trimmed; when laid, the joints for such bricks are thicker

An arch which is constructed of bricks that have been roughly cut into a wedge shape.

1. Abbr. for all wood screws 2. Abbr. for American Welding Society