Enter a clue or pattern or both:
The Clue
Some credit card security features (9 letter answer)
The Answer
HOLOGRAMS
Tags
Notes
The answer HOLOGRAMS is so rare that it appears less than once every 2500 puzzles.
Definition
HOLOGRAM as a noun:
1. (hologram, holograph) = the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography