A more thorough explanation:

Definition: A billhead is a printed invoice that includes a business's name and address.

Example: When you receive a bill from a company, the top of the page usually has their logo, name, and address. This is called a billhead.

Explanation: A billhead is a way for a business to brand their invoices and make them easily recognizable to their customers. It also provides important information, such as the business's name and address, which is necessary for record-keeping and communication purposes.