On the sine wave above, there are four obvious sections, each a quarter of the length of the wave.
Each half of the wave is (to my knowledge) describable as a pulse. But what I'm looking for is a word to describe the quarter sections. In particular the sections [0, pi/2] and [pi, 3pi/2] in which the wave goes from zero amplitude, to the maximum absolute amplitude it will achieve before going back to zero again.
If no specific word exists, any help coming up with one to use would also be nice.
I did find this page (http://zonalandeducation.com/mstm/physics/waves/partsOfAWave/waveParts.htm) which seems like it would have had the answer, though I did not find one.