What do the symbols displayed by ls -F mean?

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http://unix.stackexchange.com – I noticed that if I run ls -F on a directory, some of the entries have a * or a @ after them. spuder@ubuntu:~$ ls -F /sbin acpi_available* getpcaps* lvmconf* ntfscp* start-stop-daemon* agetty* getty* lvmdiskscan@ ntfslabel* status@ alsa* halt@ lvmdump* ntfsresize* stop@ alsactl* hdparm* lvmsadc@ spuder@ubuntu:~$ ls -F ~ daq-0.6.1/ examples.desktop noname-cache.lib snort-2.9.1/ Templates/ Desktop/ jpgraph-1.27.1/ noname.sch (HowTos)