I share the definition of “sculptural group” included in the Dictionary of Cultural Heritage of Spain:
El grupo no debe ser confundido con la estatua que se compone de una única figura en bulto redondo. A veces, en escultura, ciertos grupos no se consideran más que como estatuas, en particular cuando algunas de las figuras representadas son de pequeñas dimensiones o cuando no se apoyan sobre el suelo. Así, la Virgen con el Niño se designa comúnmente como estatua y no como grupo. Uno de los más famosos grupos escultóricos es el del Laooconte, descubierto en Roma en 1506. El grupo representa al sacerdote troyano Laooconte junto con sus dos hijos, envueltos por dos serpientes que habrían surgido del mar durante la celebración de una ofrenda a Neptuno.
Machine translation:
The group should not be confused with the statue which is composed of a single figure in round bulk. Sometimes, in sculpture, certain groups are only considered as statues, in particular when some of the figures represented are of small dimensions or when they do not rest on the ground. Thus, the Virgin and Child is commonly designated as a statue and not as a group. One of the most famous sculptural groups is that of the Laooconte, discovered in Rome in 1506. The group represents the Trojan priest Laooconte together with his two sons, enveloped by two snakes that would have emerged from the sea during the celebration of an offering to Neptune.
Example 5. Laocoön and His Sons by Hagesandros, Athenedoros, and Polydoros. Source: image by Jean-Pol Grandmont (CC BY-SA 3.0) available on Wikimedia Commons.
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