Originally Posted by
ShyTorque
I think the “I for ident” is because some, but not all of these lights flashed their station ident in morse code.
Others just flashed on/off without a specific code.
In chart sense the correct way of presenting that would be Foxtrot lima (Letters of ident), in the same way that charts present lighthouses. As above with the nautical chart decode, it's not telling you what kind of light it is, but what you expect to see from the light. F being fixed, Fl being Flashing(with code) and Oc being Occulting(with code).