A concrete masonry unit with an extended ear to receive a window or door post is known as what?

A concrete masonry unit with an extended ear designed to receive a window or door post is referred to as a jamb. The jamb is the vertical portion of a wall that forms the side of an opening for a door or window, providing structural support and a frame for these openings. This feature allows for proper anchoring and alignment of the door or window, ensuring stability and functionality.

Understanding the function of a jamb is essential in construction because it directly affects the installation and support of doors and windows, which are critical elements of a building's structure. The other terms, such as anchor, stretcher, and lintel, refer to different components or functions in masonry and construction. For instance, an anchor typically refers to a fastening device used to secure objects to a structure, a stretcher is a type of masonry unit laid flat in the wall, and a lintel is a horizontal support that spans over openings. Each of these serves specific roles that do not directly relate to the function of supporting a window or door post like a jamb does.