I believe you're talking about indicators presented by
ls -F. From the manpage of
append indicator (one of */=>@|) to entries
append indicator with style WORD to entry names: none (default), slash (-p),
file-type (--file-type), classify (-F)
To get an overview of the meaning of these indicators, we have to dive into the
info page as suggested at the bottom of the manpage (
info coreutils 'ls invocation'):
Append a character to each file name indicating the file type.
Also, for regular files that are executable, append `*'. The file
type indicators are `/' for directories, `@' for symbolic links,
`|' for FIFOs, `=' for sockets, `>' for doors, and nothing for
regular files. Do not follow symbolic links listed on the command
line unless the `--dereference-command-line' (`-H'),
`--dereference' (`-L'), or
`--dereference-command-line-symlink-to-dir' options are specified.
Above is an excerpt taken from the 'General output formatting' section. Go there directly using
info coreutils 'General output formatting'.