Secret __, System of Anonymous Voting
Puzzle 1 of Yoga Hard Pack
Question is: Secret __, System of Anonymous Voting
and the answer is: BALLOT
Word Meaning:
BALLOT — (originally) A small ball placed in a container to cast a vote; now, by extension, a piece of paper or card used for this purpose, or some other means used to signify a vote.
Definitions from Wiktionary.