dash vs underscore in file names

Angel Tsankov fn42551 at fmi.uni-sofia.bg
Thu Aug 31 01:23:32 PDT 2006

I've noticed that in the packages used to build a LFS system the dash character ("-") is extensively used in place of the space
character (" "). Before I started building a LFS system, I was thinking that the underscore ("_") was the intended replacement for 
Which one should I use for my files? Is there any convention (either written, or implied)? 

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