ContourPlot3D

ContourPlot3D[f,{x,xmin,xmax},{y,ymin,ymax},{z,zmin,zmax}] produces a three-dimensional contour plot of f as a function of x, y, and z. 

ContourPlot3D[f==g,{x,xmin,xmax},{y,ymin,ymax},{z,zmin,zmax}] plots the contour surface for which f=g. 

ContourPlot3D[…,{x,y,z}∈reg] takes the variables {x,y,z} to be in the geometric region reg. 

Please visit the official Wolfram Language Reference for more details and examples on core symbols.