This one drives me crazy.
The BlissCaps is out because of the capital L and as with the Fago and Meta because of the angle of the cuts and because there is no weight that matches this logo exactly.
McGee's FF Din solution is very tempting. Indeed. That is on this small image. But on a larger image the FF DIN that comes closest - the FF DIN Bold - shows no match. Although, for c, o and d very - VERY - close. The S I consider, although similar, out of the question. The e and n are no match. As you can see on the pict they also seem to be a bit bolder than the rest of Second.
The OfficinaSans suffers from the same problems as the Meta, Fago and BlissCaps. Too bold or too narrow and clipped under a different (Spiekerman) angle.
So, do I have a solution? No. Does this worry me? Yes. Because the way Second Life started does not suggest that a specially designed logo was used. A logotype, yes, maybe even mixing two fonts. Anything is possible. But I think the F and the E (twice) are key. I'm afraid this one will keep me out off the alley for a while.
Have fun and ... be nice to the cats
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Relax ... it is just a font