1.   An iron triangle has formed in the Broadway theater.

2.   Each constituency of the iron triangle has its reasons to be generous to Democrats.

3.   Now this iron triangle is coming under fire from a number of directions.

4.   Parents are even equipping their kids with pagers, the modern-day equivalent of iron triangles.

5.   The details lobby is a prime specimen of the workings of the iron triangle of Massachusetts politics.

6.   To really work well, the old iron triangle of unions, voters and legislators requires that there be a strong federal presence in the equation.