indenture

an agreement in two identical halves written on one sheet which then usually has the word ‘chirograph’ written between the two parts and is cut with a jagged line through that word, each half then being given to a party to the agreement, the principle being that the two halves can authenticate each other when matched up.  But in practice in Scotland, the word is almost entirely applied to a contract in a normal form drawn up between a master and an apprentice.