Star (polygon) in the context of Branko Grünbaum

A chuck is a specialized type of clamp used to hold an object with radial symmetry, especially a cylinder. In a drill, a mill and a transmission, a chuck holds the rotating tool; in a lathe, it holds the rotating workpiece.

Chucks commonly use jaws to hold the tool or workpiece. The jaws are typically arranged in a radially symmetrical pattern like the points of a star. Jawed chucks may require a wrench-like device called a chuck key to be tightened or loosened, but other jawed chucks may be tightened or loosened by hand force alone, offering convenience at the expense of gripping force. Chucks on some lathes have jaws that move independently, allowing them to hold irregularly shaped objects. More complex designs might include specially shaped jaws, greater numbers of jaws, or quick-release mechanisms.

Flags of Arab countries, territories, and organisations usually include the color green, which is a symbol of Islam as well as an emblem of purity, fertility and peace. Common colors in Arab flags are Pan-Arab colors (red, black, white and green); common symbols include stars, crescents and the Shahada.