I want to add the new 2012 Turkish Lira currency symbol, U+20BA, to Character Viewer as shown at
What can I do?
Here is a reference to a font which will give you the character you are looking for in Character Viewer
You may need to deactivate some other font if that has an interfering character -- I had one called PT on my machine.
option+T makes the ₺ symbol if you have your keyboard set to Turkish - QWERTY PC