How about Σ Sigma notation for summation? It's often written with something like i=1 at the bottom and 1000 at the top to denote the summation from 1 to 1000. T

How about Σ Sigma notation for summation? It's often written with something like i=1 at the bottom and 1000 at the top to denote the summation from 1 to 1000. The Wikipedia article at https://en.wikipedia.org/wiki/Summation https://en.wikipedia.org/wiki/Summation has some examples.