1. A small, round piece of metal alloyed to the base wafer of an alloy-junction transistor. Also known as dot.

2. The container that holds the carbon granules of a carbon microphone. Also known as carbon button.

1. Mass of metal remaining in a crucible after fusion has been completed.

2. That part of a weld which tears out in the destructive testing of spot-, seam-, or projection-welded specimens.