The ‘Draw graph’ icon shows the list of options for creating a tactile mathematical graph. You can also find these options in the Graphs menu. From this list, you have a choice to either use an empty grid, create a graph by entering your own formula or using one of the TactileView example graphs.
There are a lot of different aspects when it comes to mathematics in braille and creating or reading tactile graphs. The detailed introduction will explain everything you need to know about the background concepts. In the other entries in the ‘Graphs and math’ section of the manual you can read how to use different styles of graphs and learn how to create them using different input methods.
‘Draw graph’ icon: