Which makes no sense at all as a monkey is, in archaic naval parlance, a brass triangle which iron cannon balls are piled up inside of.

FORBES: Why Wind Power Doesn't Work

The iron triangle of employers, accountants and insurance providers has levelled health spending after years of steady growth.

ECONOMIST: Health care

Highly organized professional educators, sympathetic liberal legislators and a constituency of manipulable education consumers form a classic "iron triangle" that has proved impervious to reform.

FORBES: Are We Spending Too Much On Education?

Instead of housing and retail, parking lots for Mets fans would initially replace dozens of businesses in an area known as the Iron Triangle to the east of Citi Field.

WSJ: Plan Upends Willets Vision