What does RF stand for?

Redjfir

Red Fmake

Red Flame

Reedereigemeinshhaft Forschungsschifffahrt

Reef

Reef: To temporarily reduce the area of a sail exposed to the wind, usually to guard against adverse effects of strong wind or to slow the vessel. Reef: Rock or coral, possibly only revealed at low tide, shallow enough that the vessel will at least touch, if not go aground.

Refed

Rekeeding

Reference Flats

Reference Flight