I'm not sure if this is an actual logo or just an interesting graphic, but its clever and visually pleasing. Its a clean and simple design, that at first glance just looks like a tally mark symbol. Then the i and ! become evident, and the message "hi (high) 5!" becomes obvious. This could be replicated in a hand rendered font and it would still work, but the sleek lines in the chosen font make it a sleek design.