Most of us know what was meant
but just to clarify, there is no FA 25mm. It's either the D-FA (first version made principally for the Japanese market, it seems, and now discontinued) or the DA (made for the global market). The version I have is the DA, which is the only version that was officially available in Canada. The Ricoh Pentax Canada web site still lists the lens as D-FA in the text, but this is incorrect; the product shot they have clearly shows "DA" on the lens. The Ricoh Pentax USA site correctly calls it the DA in the text, and shows the same on the product shot.
I don't know if there's ever been any official distinction between the two versions of the lens, other than the optical difference that the D-FA covers full-frame 645 without vignetting. Perhaps the mechanicals were updated as well?
My DA 25mm has been fine. It has traveled thousands of km by air, and been driven thousands more. It has been to Iceland, the US southwest desert, the Caribbean, the Canadian Rockies, the Alberta badlands and I suppose a few other places. I've shot it in all weather & conditions from driving wind to -30C with windchill to +47C in baking sunlight to 100% humidity, with everything from dust to sand to silt to volcanic grit, and moisture from rain, ice & snow to sea spray to condensation. I do my best not to mistreat my gear, but I don't baby the kit, either. These are field working tools and I work them relatively hard. Other than blown shutters, so far so good for me in the field...