what is POLYFORM?

[Alberto Candel]

I have a program that outputs a list, like {2, 3, 6, 19} say. The numbers are the terms of a series, so I wanted to add them up. Instead of copying that into the SUMLIST command, I hit STO and them SUMLIST. My HP displayed POLYFORM({2,3,6,19},SUMLIST) and the result 30.

I cannot find anything about POLYFORM in the help menu. It does the above, but, what else? Anybody knows? Thanks