The phrase "a memorial tablet" is correct and usable in written English.
It can be used to refer to a plaque or stone that commemorates a person or event, often placed in a public space or at a gravesite.
Example: "The town unveiled a memorial tablet in honor of the soldiers who fought in the war."
Alternatives: "commemorative plaque" or "memorial plaque".
It was a memorial tablet, erected for political martyrs.
Charles Ira Young Memorial Tablet & Medal - A memorial tablet to Charles Ira Young, class of 1883, has been placed in the Engineering Bldg. by friends of Mr. Young.
Leaving his wife to comfort her sister, he visits the church of Llanyspytty, where he becomes intrigued by a memorial tablet to Millichamp Howel - Artist and Benefactor - 1866-1941.
Now an Anglican church, there are signs of Cromwellian vandalism, such as angels' faces smashed by the iconoclastic Roundhead soldiers, and, intriguingly, a memorial tablet to a Galwegian Jane Eyre – local legend has it she was the inspiration for Charlotte Brontë's heroine.
There is also a memorial tablet at the south-eastern edge of the nearby Heugh Battery (above) which marks the first place to be hit by a shell.
In 1896, the Thomas Starr Society placed a memorial tablet on the site.
(a) The installation of a monument, memorial, tablet, structure, or other commemorative installation in a park area without the authorization of the Director is prohibited.
(a) The installation of a monument, memorial, tablet, structure, or other commemorative installation within the area administered by the Presidio Trust without the authorization of the Board is prohibited.
Under the 8th dynasty of Babylon, however, King Nabu-apla-iddina (c. 880) rebuilt Sippar's great Temple of Shamash and recorded that while digging in the ruins he found the ancient image of the god, and he depicted himself and Shamash on a stone memorial tablet.
Its novel refinements are evident in the show in a set of funerary dishes, replete with an inscribed memorial tablet, covered with feathery white crosshatch patterns stamped on a gray-brown background.
King's Chapel in Boston, where Holmes worshiped, erected an inscribed memorial tablet in his honor.
