What is the main function of double strands in handcuff nomenclature?

The main function of double strands in handcuff nomenclature is to provide a secure and fixed connection around one wrist. Double strands ensure that the handcuffs can effectively restrain an individual's wrist without the risk of slipping or accidental release. This design is crucial for maintaining safety and control in situations where an individual may resist or attempt to escape, as it emphasizes the need for a reliable binding method.

While some of the other options consider relevant aspects of handcuff function, such as adjusting to wrist size or facilitating movement, the fundamental purpose of a double-strand design is to enhance the security of the restraint. It is vital that the handcuff remains securely fastened to prevent any possibility of the individual's hands being freed, which could lead to potential harm to the officer or others.