Couple of new glossary additions.

[willbrooks]

I added Keith's flying D photo to that entry and I also added 2 new entries:

Pareidolia: The phenomenon where people see patterns or objects in otherwise random data. People often “see” extra design elements that aren’t really there in a coin’s damaged areas, plating blisters, stains, etc.

...and...

Grease Mold Doubling (Stiff Die Fill Raised Design Element Doubling): error-ref.com‘s term for a recently discovered form of doubling being found on cents from the mid to late 1990s, affecting the terminal digit of the date. In this term, the word “mold” is used as in “jello mold,” not as in “black mold,” or fungus. Presumably, a greasy/gunky film covering the die surface can become hard enough from the striking process that it forms a solid mold of the design element. If this solid mold of gunk begins to shift into the field from its original position, and since it is in the same shape as that portion of the die, it can create a raised design element in an offset position. Of course, since this mold will be somewhat smashed during the strike, the slightly raised element will be larger that the original design element. In addition to the link at the beginning of the entry, please also see this article by Mike Diamond for more information. The images below were donated by jallengomez and Joel.