> So I've been reading about what the different symbols at the end of games mean.
> Example: (!) (a) (u) etc. There's a fairly long list...
> 1.) I know that (b) means Bad Dump, (o) means Overdump and (h) means Hack.
> -But what does it mean when there are numbers attached to the letters? Example:
> (b4) (b1), (o4), (h3) etc?
In the case of softlists, MAME picks up the best collections available or whatever the softlist creator sees fit. That could mean the internal filenames are named after conventions like TOSEC, redump, trurip, good sets or even the webpage filenames the dumps came from.
What you name is the goodxxx naming standard (GoodNES, GoodSNES, GoodGen, GoodPCE, etc.). When there's more than one dump type identified by the tool, it's common to attach numbers to them. So you can differ bad dump number one (b1) from bad dump number two (b2), both are bad dumps from the same game but with different data checksums.
Taking advantage of the topic I would like to ask something about the redump standard that makes me scratch my head since forever. If I have something like "Sakura Taisen 2 - Kimi, Shinitamou Koto Nakare (Japan) (Disc 1) (3M, 4M).7z" what makes it different from simply "Sakura Taisen 2 - Kimi, Shinitamou Koto Nakare (Japan) (Disc 1).7z". In resume, what do the "(nM)" convention mean?