No its not a Mitsubishi car symbol. Its an icon of the cross section of a an architectural scale. The actual tool is for Annotative scaling of annotation objects like text, dimensions and graphical symbols. This feature was added a few releases ago, but I realized from teaching, that there are a lot of folks who are still working in Model Space, doing things the old way, and aren't aware of Annotative scaling.
By using the annotative scaling, it takes care of all the busy work of text sizes when changing scale. The quick, down and dirty of making it work, is to have all of these buttons turned on. They will lit up and showing the light bulb and lightening bolt in yellow once on. Also you need to be using Annotative text or dimensions. Set your scale and start drawing. The text and dims will display at the correct height per your settings and when you change the scale they will update. I last cool thing is that the text will scale according to the Viewport scale. Annotative scale rocks! Enjoy!!