What is the hash key on laptop?

Excuse me, could you please clarify what you mean by "hash key" on a laptop? Are you referring to a specific security feature, such as a password hash that is used to store passwords securely on the device? Or are you perhaps asking about a physical key that might be used to access certain functions or features of the laptop? Could you provide a bit more context or detail about what you're asking? It would help me give you a more accurate and helpful answer.