A device that connects two keyboards of an organ together so that they play together.
An electrical device used to transfer energy from one electric device to another, especially without a physical connection.
Anything that serves to couple things together; but especially a device that couples railway carriages.
A device used to convert electronic information into audible sound signals for transmission over telephone lines.
A ligament that limits the movement of an organ or part.
A bond or link signifying union.
A horizontal line over the top of some of the terms in an expression, indicating that that part of the calculation is to be done before other parts.
Specifically, the horizontal line between the numerator and denominator in a fraction.