The same as in english.
The "S" on an elevator in Spanish stands for "Suelo," which means "ground" or "floor." It indicates the main floor or ground level of a building.
floor or ground
It generally means "plant", but can have different meanings in certain expressions. For example, "planta baja" means "ground floor".
the ground floor is called 'le rez-de-chaussée' in French.
"En la planta baja hay" translates to "On the ground floor, there is" in English. It is commonly used to indicate the presence of something or someone located on the ground floor of a building. The phrase sets up for further information about what can be found in that location.
On the floor/In the background
It can be used as a metaphor for a compromise.
"Piso" can have different meanings depending on the context. In Spanish, "piso" can mean floor or apartment. In Filipino, "piso" refers to the currency unit equivalent to 100 centavos.
floor in Spanish is piso
"Primer piso" means "first floor."
The ground floor is at ground level so the floor immediately above it must be the first floor.
"Suelo" is a Spanish word that translates to "ground" or "soil" in English. It can refer to the surface of the earth or the floor of a building. In a broader context, it can also be used metaphorically to describe a foundation or basis for something.