An idea is simply a unit of content on Goodpoint. Meaning, it's a small bundle of information that we keep in one piece so that the system works right. For example, when you look at an outline, every line is an idea.
The point is essentially a constellation of ideas.
I, 2, and 3 are are ideas, just as 1A or 3Biiii are ideas. Ideas have information inside them, whether they be facts, opinions, or URLs. Taken together, they serve as support for a point.