How do I keep Control-Alt-Delete from rebooting the system?

Frequently Asked Questions for FreeBSD 2.X : System Administration : How do I keep Control-Alt-Delete from rebooting the system?
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8.21. How do I keep Control-Alt-Delete from rebooting the system?

Edit the keymap you are using for the console and replace the boot keywords with nop. The default keymap is /usr/share/syscons/keymaps/us.iso.kbd. You may have to instruct /etc/rc.conf to load this keymap explicitly for the change to take effect. Of course if you are using an alternate keymap for your country, you should edit that one instead.