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When several buffers visit identically-named files, Emacs must give the buffers distinct names. The usual method for making buffer names unique adds `<2>', `<3>', etc. to the end of the buffer names (all but one of them).
Other methods work by adding parts of each file's directory to the
buffer name. To select one, customize the variable
uniquify-buffer-name-style (see section AD.2.2 Easy Customization Interface).
For instance, the forward naming method puts part of the
directory name at the beginning of the buffer name; using this method,
buffers visiting `/u/mernst/tmp/Makefile' and
`/usr/projects/zaphod/Makefile' would be named
`tmp/Makefile' and `zaphod/Makefile', respectively (instead
of `Makefile' and `Makefile<2>').
By contrast, the post-forward naming method would call the
buffers `Makefile|tmp' and `Makefile|zaphod', and the
reverse naming method would call them `Makefile\tmp' and
`Makefile\zaphod'. The nontrivial difference between
post-forward and reverse occurs when just one directory
name is not enough to distinguish two files; then reverse puts
the directory names in reverse order, so that `/top/middle/file'
becomes `file\middle\top', while post-forward puts them in
forward order after the file name, as in `file|top/middle'.
Which rule to follow for putting the directory names in the buffer name is not very important if you are going to look at the buffer names before you type one. But as an experienced user, if you know the rule, you won't have to look. And then you may find that one rule or another is easier for you to remember and utilize fast.