A single paradiddle consists of two single strokes and then two hits on the same hand. (Shown in the picture above). The basic sticking is either R-L-R-R or L-R-L-L.
A double paradiddle consists of four single strokes and then teo hits on the same hand. The sticking for this is
R-L-R-L-R-R or L-R-L-R-L-L
A triple paradiddle follows the same exact pattern as before except adding two more single strokes. In total, six single strokes and two hits on the same hand. The sticking is R-L-R-L-R-L-R-R or L-R-L-R-L-R-L-L.
Paradiddle-Diddles are played as two single strokes on different hands, than two diddles. The sticking is R-L-R-R-L-L or L-R-L-L-R-R.
Some that aren't heard of as much as parapadiddles, played as R-L-R-L-L or L-R-L-R-R.