A Ship Emblem is an official patch or symbol that represents a UNSC ship. Each and every ship has one, and each one is unique according to its name or crew.
The tradition of creating an emblem for each ship dates back to the ocean navies of the individual Earth nations, each of which had a ship emblem as well. It should be noted that UNSC Military units have unique patches as well.
These emblems usually contain the ship's name and Hull classification symbol as well as images or other information related to the ship.
Ship Emblems are usually worn by command personnel, most notably the captain of the ship, for recognition, and for personal pride.