Just did my Calc BC hw on FTOC and even I don't know what the 3rd integral is! (jk there's no meaning).
Other than that, I vote yes on a sequel
Multiple integrals usually mean that the function has multiple variables with real values. Triple integrals are most often used for finding the value of a function that describes a three-dimensional volume. The function can be in Cartesian coordinates (x,y,z) or polar coordinates (ρ, θ, φ).
Triple integrals can also be used for other multivariate formulas, like Maxwell's equation, but unless you are doing some hard-core physics, you will probably never run into them.