Using strings to manage lists

I have used strings to separate elements within a list (lines, points) but what I would really like to do is use string components to assign specific information to these elements.

To be more specific.

I would like to use scene geometry with three reference points (for example) arrayed along a curve.

These points have a specific relationship to the geometry which I would prefer to control in the scene.

I would like to assign string identifiers to these elements (Referenced Point - A, Referenced Point - B, Referenced Point - C) in order to easily access them from lists (using the dispatch) at different stages within my definition.

I cannot wrap my head around the concept of modifying a string, and re-applying this to the element.

Is anyone doing this, or have any good ideas?

Many thanks,

Matt