It stands for 'amplitude'. This is the letter 'omega'. It stands for 'angular frequency'. C7a that you already have. In other words, this part is redundant with part C7a that you already have.
Adults use Fortran.
He did nothing relevant in physics because he found religion. I often get confused. It's just not true. But I'm not sure if thinking gets you anywhere. Nobody knows how to make coherent virii.