Tab

1. A small projecting part: This could be found on a tab washer or a gasket, where it engages with another seal. It’s essentially a small protrusion that serves a specific purpose in the assembly or sealing process.
2. A short flange section: Unlike a continuous flange, which is a continuous protrusion or lip, a tab in this context refers to a shorter section of a flange. It’s used to provide localized fitting of one panel to another, often in automotive body construction or similar applications.

As for its abbreviation in automotive terminology:

• Thermactor Air Bypass Solenoid (TAB): In the automotive context, TAB stands for Thermactor Air Bypass Solenoid. This is a component used in the Thermactor air injection system, which is part of the emissions control system in some vehicles. The solenoid controls the flow of air in the system to help manage emissions.