Over AR Used after a call to a specific station, to indicate end of  instant transmission.

KN Used at the end of any transmission when only the  specific station contacted is invited to answer.

Stand by or wait AS A temporary interruption of the contact.

Roger R Indicates a transmission has been received correctly and in  full.

Clear SK End of contact. SK is sent before the final identification.

Leaving the air CL Indicates that a station is going off the air, and will not listen for any
further calls. CL is sent after the final identification.