/dev/tty /dev/console /dev/tty0

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/dev/tty        Current TTY device
/dev/console    System console
/dev/tty0       Current virtual console
In the good old days /dev/console was System Administrator console. And TTYs were users' serial devices attached to a server. Now /dev/console and /dev/tty0 represent current display and usually are the same. You can override it for example by adding console=ttyS0 to grub.conf. After that your /dev/tty0 is a monitor and /dev/console is /dev/ttyS0

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