A variant of the Bessel functions named for this adjective is proportional to "J-sub-nu plus a half" of z, all over the square root of z. This is the first word in the name of a class of functions whose definition may contain a power of negative one per the Condon-Shortley convention. Functions arising from solving Laplace's (luh-PLOSS-ez) equation in which an exponential term multiplies a Legendre (luh-ZHAHN-druh) polynomial are called this kind (10[1])of (10[1])"harmonic." A volume element involving the term "r squared sine theta" arises in (10[1])a system named for (10[1]-5[1])this adjective (-5[1])that uses radial, polar, and azimuthal coordinates. This adjective names a type of symmetry of three-dimensional systems that look the same from any orientation. For 10 points, give (10[1])this adjective pertaining to a shape whose surface area is 4 pi times (10[1])its (10[1])radius (10[1])squared. ■END■