What is the pound and star on a phone?

Excuse me, could you please clarify what you mean by "the pound and star on a phone"? Are you referring to the symbols on a keypad, specifically the "#" symbol, often referred to as the pound sign, and the "*" symbol, often referred to as the star? If so, these symbols are typically used for various purposes depending on the device and application, such as navigating menus, making selections, or entering special characters in text messages or searches. Is there a specific context or scenario in which you're curious about their use?