In the study titled, The Role of Visualization- In the Teaching and Learning of Mathematical, it explains that “visualization, as we see, has been a technique generally used by the most creative mathematicians” of all times. Knowing the importance of having students visualize what a math concept might look like means that we must give our students tools to help them visualize math.
Here is an interactive online math dictionary and over 250 math charts created by an Australian educator named Jenny Eather. I love how students can select a math term, get the definition, have an example and in many cases practice the skill. FYI…in Australia they refer to Mathematics as Maths (with the “s” on the end) so there isn’t a typo;)
‘Imagery is a powerful force for perception and understanding. Being able to “see” something mentally is a common metaphor for understanding it. An image may be of some geometrical shape, or of a graph or diagram, or it may be some set of symbols or some procedure.’
One tool that I think might fall into what you are thinking about is Illustrative Mathematics. The site provides visuals of the range and work of mathematical concepts that students need to learn according to the Math Common Core Standards. It lets you drill down into the standard strands to the concept level and see illustrative examples of the mathematical work for that concept. A teacher that I worked with recently told me she uses them as a visual reference for students that replaces writing the objective on the board. In this time of transition, this site has been helpful for many educators I have worked with in CCSS schools.