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The star symbolizes Mary
The last sign is a schematization of Mary’s anagram
The Cister changes the majestic function in the eleventh century and early XII of mother of God (Cluny period) for her role as Mediatrix to God (Cister period) For this reason there are no stars significantly in Spain until the arrival of the Cistercian (2nd third of XII century).
Churches:
Santes Creus (Tarragona), San Cebrián de Campos (Palencia), Santa Cecilia de Vallespinoso de Aguilar (Palencia), Santa María de Sirga (Palencia), Santa María de Mave (Palencia), Santa María de Fitero (Navarra), Nuestra Señora de la Asunción de Saúca (Guadalajara), Santa María de Toro (Zamora), santa María de Chalamera (Huesca).
Read more in The stonemason’s signs in the Romanesque churches in Spain.