The Atcha® symbol
During the ideation process, I sought to create a mark that combined the concepts of both # and @ symbols.
Below is what I originally called the "at-hash", later awarded a trademark & design patent as "atcha":
Below is what I originally called the "at-hash", later awarded a trademark & design patent as "atcha":

App concept
Working closely with a team of 5, I created wireframes for the forthcoming NumberStation app:







And a handful of visual design concepts that resulted:



