A dedication plaque is a metal plate found on the bridges of most Federation starships. The information on the plate has varied over the years, but most often lists the name of the ship, the registry number, the class of the ship, the ship yard of origin, and a quote from a historical figure. Some plaques also include a listing of the officers involved in the construction of the ship.
A version of the USS Enterprise-A's dedication plaque had an attribution to the Starfleet Charter, specifying that the ship's motto, "… to boldly go where no man has gone before", was excerpted from that document. (ST reference: Mr. Scott's Guide to the Enterprise)
Some dedication plaques were not placed on the bridge, nor specifically for the ship itself, but for other memorable people and locales on a starship. By approximately 2294, John Harriman had a plaque dedicated to James T. Kirk installed on the USS Enterprise-B. It was in the area of the ship where Kirk was at the time believed to have been killed. (ST comic: "Spock: Reflections, Issue One")
In an alternate timeline, Jean-Luc Picard chose the words "...Sokath, fas eyes uncovered..." to be the motto on the dedication plaque of the USS Phoenix, a reference to his encounter with the Tamarians. (DS9 - Millennium novel: The War of the Prophets)