A standard ground joint, socket, or single refers to a type of laboratory glassware that is used to connect two pieces of glassware together. It consists of a socket, or female end, with a ground glass surface that fits into a matching cone, or male end, forming an airtight seal.

This joint is commonly used in chemical experiments and is favored for its ease of use and reliability. The single socket joint is a basic design, with one socket end, which allows for connection to a single piece of glassware. This joint is commonly used in laboratory setups where a simple, single connection is needed.