Meaning of ASSIGNMENT in English
Options are exercised through the option purchaser's broker, who notifies the clearinghouse of the option's exercise. The clearinghouse then notifies the option seller that the buyer has exercised. When futures options are exercised, the buyer of a call is assigned a long futures contract, and the seller receives the corresponding short. Conversely, the buyer of a put is assigned a short futures contract upon exercise, while the seller receives the corresponding long.
A guide to futures and options market technology English dictionary. Английский словарь-руководство по фьючерсам и опционам рыночных технологий . 2012