A "12 pencil cracker" refers to a type of firework, typically about 12 inches long, that produces a bright, steady stream of sparks, often gold or silver, when lit. These are considered classic sparkler-type firecrackers, popular for their attractive and long-lasting visual display, which creates a magical atmosphere for celebrations like Diwali, festivals, and marriages. They are designed for safety, with features like low smoke emission, and are ignited by holding their base or placing them on a flat surface.