as "LFl", and in certain publications abbreviated alternatively as "L.Fl".

The IALA Marine Buoyage System allows (but does not mandate) long flashing lights to be used wherever a single flashing light is allowed to be used. The long flashing light must be used for the same purpose and have the same light colour as an equivalent single flashing light.

A white coloured long flashing light with a period of 10 seconds is additionally specified as an option for safe water marks.

To satisfy the constraint specified by IALA

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