What is "double straddles"

Usage examples of "double straddles".

He had come out of Harvard with a reputation for monetary sorcery and, after going to Wall Street when he was nineteen, had become the head magus of a band of spaced-out financiers calling themselves Asgard Equities, which through a series of lightning coups - option-pumping, feigned tenders, double straddles, and a lot of other techniques I but dimly comprehend - had within five years gained control of a billion-dollar corporate empire with extensive holdings on every continent but Antarctica.