A narrow fissure in the surface of a die which produces a raised line on the coins it strikes.
A fine raised line on a coin caused by a broken die. There are many examples of die cracks on the 1/13th series.
Die Cracks are fine raised lines that typical go from one detail in the design to another; they are usually not a single straight crack, but a series of small erratic cracks to connect the two points of the design.
A raised, irregular line on a coin, ranging from very fine to very large, some quite irregular. These result when a hairline break occurs in a die.