I think this might be called an Interior Die Break? The area seems to be just under 4 square mm. Over 4 square mm is clearly classed as an Interior Die Break. According to error-ref, the size between 1 and 4 square mm is a grey area.
Quote:Since voids left in the die face by natural fractures span an unbroken size continuum, there is no clear boundary between a "die chip" and an "interior die break".
Any void encompassing an area of 4 square millimeters or more qualifies as an interior die break. Any void that covers less than 1 square millimeter is a die chip. In between is a gray area.
http://www.error-ref.com/?s=interna...e+break