"Jackrock" redirects here. For the anti-personnel device sometimes called a "jackrock" in the U.S., see caltrop. A collection of jacks within the permanent collection of The Children's Museum of Indianapolis Pieter Bruegel the Elder – Children's Games (detail) – Knucklebones Knucklebones, also known as scatter jacks, snobs, astragaloi (singular: astragalus), tali, dibs, fivestones, jacks, jackston
![Knucklebones - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/fdd423b07ff7c52e574cd4652419b534fe3665bf/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fe%2Fec%2FThe_Childrens_Museum_of_Indianapolis_-_Jacks.jpg)