1997 D Lincoln Cent Die Chip

Quote:
Die Chips
Definition: A small piece (less than 4 square millimeters) that falls out of the die face and has no direct connection to the design rim. The missing piece leaves a void in the die face into which coin metal flows. As a result, the coin shows a featureless lump in the affected area.
A die chip can be connected to a die crack or it can be freestanding

Quote:
Die Breaks
Definition: A die break is a form of brittle failure in which a piece of the die face breaks off and falls out. Mint workers call this kind of defect a "piece-out". Tiny die breaks tend to form within narrow interstices of the design. When not connected to the rim, such tiny die breaks are referred to as "die chips".
The vast majority of large die breaks occur at the die's margin. The sharp junction between die neck and die face is particularly prone to failure. Any die break that involves the rim and at least a little bit of the field is called a " Cud".
Most die breaks represent cases of spontaneous brittle failure. A small minority of die breaks arise as the result of impacts. The latter are often accompanied by signs of die damage in the intact portion of the die face

Quote:
Die Dent
Definition: An area of the die is damaged by a known or unknown object, which leaves a recess in the die face. The die dent therefore appears raised on the coin.

Quote:
Die Gouges
Definition: Die gouges occur when a foreign object is dragged across, and digs into, the die face. Such gouges will appear as raised areas on the coin's surface. Die gouges are easily confused with linear die dents. The former are most easily diagnosed when there are clear longitudinal striations within the body of the die gouge.