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The "Ram" in "ramjet" isn't an abbreviation, and doesn't stand for anything. It is called a "Ramjet" because the air is rammed into the engine.
Ramjet is not used in many fighter aircraft as it has not yet been sufficiently developed.
Roger Ramjet - 1965 is rated/received certificates of:
Australia:G
USA:TV-G
Ramjet
Lompoc