Is it possible to have more than one D.S. when charting a song? if so, how would you know which Segundo?
This would be a great tool for saving space in a chart.
D.S. and D.SS. are sometimes used. Same for codas. Possibly useful for saving paper when a score won't have to be sight-read! But, in these days of computer score preparation, it's little extra work to play safe and write it out if there's any chance of confusion.
I have seen parts almost as silly as this!