Keying

urn:mrn:iala:dic:5-3-0055

The forming of signals (such as those employed in a telegraph transmission) by the modulation of a direct current or other carrier between discrete values of some characteristic.

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

English

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