PointSymbolizer - GeoServer 2.19.x User Manual
A PointSymbolizer styles features as points. Points are depicted as graphic symbols at a single location on the map. A contains an optional element, and a required element specifying the point symbology. Specifies an external image file to use as the symbol. Specifies a named shape to use as the symbol.
https://docs.geoserver.org/latest/en/user/styling/sld/reference/pointsymbolizer.html
