* Patronuses: Patronuses are magical messengers that can be sent to deliver messages or warnings. They are invisible to anyone who is not a member of the Order of the Phoenix.
* The Marauder's Map: The Marauder's Map is a enchanted map of Hogwarts School of Witchcraft and Wizardry, which shows the location of every person in the castle. It is used by the Order of the Phoenix to keep track of the movements of Death Eaters.
* Floo powder: Floo powder is a magical substance that can be used to travel through the Floo Network, a system of fireplaces which are connected by magic. The Order of thePhoenix sometimes uses the Floo Network to send messages or transport supplies.
* Owls: Owl are often used as messengers in the wizarding world. The Order of the Phoenix sometimes uses owls to send letters or packages, especially when stealth is required.