[cwilkes]

Most of these entries are Naticks where the two crosses are proper nouns. That’s really unpleasant as it usually means there’s no way to figure out the cross unless you know the two terms.

https://en.wikipedia.org/wiki/Rex_Parker

In 2008, he invented on his blog the crossword term "natick" (after Natick, Massachusetts) for an "unguessable" square crossed in both directions by proper nouns considered obscure.