If you want to use symbols on the iPhone, iPad or iPod touch other than just some smilies then you can add another keyboard that allows you to do that. I use the symbols a lot when I am creating to do lists in notes, by using symbols it can indicate the task type such as filming or computer work, urgency or who I’ve asked to do that task. Visually it really helps me. It also livens up the lists a bit more rather than just plain text.
What the video below to see how to do this.