Entering symbols on the iOS keyboard

Today I was trying to enter a degree sign ° in an iMessage. You can switch layout to numbers and then symbols that gives you a few symbols but not degree. I googled and found a lot of links about enabling the Emoji keyboard and copy/pasting from a sync'd document. I googled a bit more and found that it's simpler than that, just press and hold the zero key and it gives you an option of inserting zero or degree. Quite a few of the other keys have multiple meanings too, I am too lazy to list them all here.