From International Dictionary of Marine Aids to Navigation
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Diaphragm (in a compressed-air diaphragm horn)

A flexible disc supported at its periphery which constitutes the moving part of the valve which admits compressed air to the throat of the horn.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM