Plain English Meaning
Kopter is one of the made-up, easy-to-say names the FAA assigns to instrument arrival and departure routes so pilots and controllers can say the route's name on the radio without confusion.
Full Definition
Kopter is a pronounceable name code used as part of an ICAO standard instrument departure (SID), standard terminal arrival (STAR), or other procedure designator. It functions as a phonetic identifier that pilots and controllers can speak clearly over the radio, paired with a validity indicator and route number to specify a particular published procedure.
Context Anchor
Seen in instrument procedure or route designator tables that explain what each letter in a designator means.
Derivation
Kopter is a phonetic spelling derived from '.' The respelling avoids the silent letters and unusual sound combinations of the original word, making it unambiguous when spoken over a radio.