Playfair

Meanings

1. A surname.
2. A placename
3. A number of craters in Solar System.
4. A crater in Mars, Solar System.
5. A crater in Moon, Earth-Moon System, Solar System.

1. Ellipsis of Playfair cipher.
2. an encryption using the Playfair cipher
3. A form of crossword in which some words must be encrypted with a Playfair cipher before being inserted into the grid, and solvers must deduce the codeword and the encrypted clues.

Etymology

* (craters): The craters are Named after Scottish mathematician, scientist and C of S minister John Playfair * (cipher): The cipher is Named after British Lord, baron, politician and scientist Lyon Playfair, who popularized the cipher.