Meaning
Sunya® ("u" pronounced as "oo" in the word "book)" is a word from Sanskrit, the ancient and clasical language of India. Our modern number system was invented in India 1,500 years ago.
Sunya® has the meaning of being empty or without any quantity. When a player goes out of cards to win he/she says "sunya" asserting he/she is out of cards and he/she has won.