Cruciform Filament

From International Dictionary of Marine Aids to Navigation
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A filament composed of two grid filaments at the same light-centre-length, intersecting symmetrically at right angles along the axis of the lamp.

Ch2 Fig28.jpg

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