Left: The real part (blue) and imaginary part (red) of the wave function. Right: The QM probabilitiy density for the particle. The top two rows are the lowest two stationary states (energy eigenstates plus time-dependence) and the bottom is the superposition state Ψ_N = (Ψ_0+Ψ_1)/sqrt(2), which is NOTt a stationary state." (Slightly edited.)

Features:

1. The capital Greek letter Ψ (pronounced and named Psi) is the common symbol for the wave function.

2. The QM probabilitiy density ρ which is equal to the square of the complex-number absolute value of the wave function: i.e., ρ = |Ψ|**2.

   The QM probabilitiy density is, among other things, the probability density for measuring a particle at any point in space.

3. The full wave function is always time-dependent as the animation shows.

4. The stationary states are called stationary because their since their QM probabilitiy densities are time-independent as the animation shows.

5. The superposition state is NOT a stationary state, and hence its QM probabilitiy density varies in time.