Final answer:
A three-quarter brick is known as a King Closer, used for finishing courses or spacing in brickwork, filling gaps that do not fit whole bricks, especially around corners and openings.
Step-by-step explanation:
The three-quarter brick mentioned in the question is commonly used in brick construction for finishing a course or spacing regular bricks is known as a King Closer. This term refers to a brick that has been cut lengthwise from one corner to the opposite end, creating a brick that is three-quarters of its original length. King Closers are used to fill in spaces that do not fit whole bricks and are useful in maintaining the bond pattern of the brickwork at the corners of walls or around openings like windows or doors.
The other options provided do not correspond to the three-quarter brick used in this context: Soldier Bricks are typically whole bricks stood vertically, Header Bricks are used to bond two walls at a corner or create an overlap, and Rowlock Bricks are laid on their sides, with the narrow end visible in the facing.