Queen closer - It is a term applied to a brick which is half as wide as a full brick. It is made by cutting a brick lengthwise into two portions.

Quick setting cement- When concrete is to be laid under still water or in running water , quick setting cement is used advantageously. The setting action starts within five minutes as it becomes stone-hard in less than an hour.

Quoin - The exterior angle or corner of a wall is termed as quoin. The brick or wedge shaped stone used for the corner of walls is also known as quoin.