A “Leporello” is a booklet in the form of a long strip of paper. It is folded like an accordion. A “Leporello” is therefore also known as a folding book. 

The name “Leporello” is taken from the opera “Don Giovanni” by Amadeus Mozart. This opera features the womaniser Don Giovanni, who has a servant called Leporello. He has been commissioned by his master Don Giovanni to compile a list with the pictures and names of all the ladies he has seduced.

Leporello stapled many sheets of paper together, and as they grew longer and longer, he folded them. The name "Leporello" emerged from the folded booklet.