With this programming tool, you can see the glyph for any Unicode value, as supported in any iPhone provided font.

Picker wheels allow easy selection of fonts and “code blocks” of the Unicode character set. The character code may be entered in decimal or hex, or use the keyboard for the Basic Latin set.

Changes:

Copy/Paste added.
Clicking in text area no longer clears previous character.
Editing numeric text field now updates character as you type.
Character and base now remembered between runs.
Minor bug fixes to scrolling.

http://appshopper.com/utilities/unicodelab