1) Business form 2) The heading itself 
Billhead receipts are receipts that were commonly used in business transactions from the late 1860s through the early 1940s. They can be found in present-day transactions, although they are less common today. Many billhead receipts were illustrated and decorated with fancy steel engravings, while others carried no illustrations. In either case, th...
• (n.) A printed form, used by merchants in making out bills or rendering accounts.
Bill'head` (-hĕd`) noun A printed form, used by merchants in making out bills or rendering accounts. 
a sheet of paper with a printed heading, usually giving one's name and address, on which a statement of money due is rendered. · the heading itself. · a printed form for itemized statements.