I have made my choice.
Sharon was commenting on fingering vs. sock yarn. As far as I know they are the same as far as the gauge of the yarn is concerned. Usually fingering applies to yarn for knitting garments and sock yarn is usually for socks, except when it's not. Sock yarn can be used for garments too and is referred to more often than fingering now. The difference may have something to do with how they are spun. Sock yarn is usually spun so it's tougher.
Does anyone else want to wade in here with any comments?