Over the years, the terminology used to refer to the "Red Triangles" has had some changes in an atempt to make the reference to them easier for the new user. Some of us old folks will on occasion use an old term for it in our discussions. The current documentation refers to it as a "Red Triangle"
Taken from the Help Contents:
How to Access Analysis Options
Click the red triangle menu in a report to access a list of options that apply for that particular report. In addition to clicking the red triangle menu, you can also:
I look at the evolution of such things as good attempts to improve the product and documentation
Jim