UniKey is a lightweight and portable application that helps you identify special Unicode characters which are not available in the Character Map window of a font type.
Since installation is not a prerequisite, you can drop the executable file somewhere on the hard disk and click it to run. It is also possible to store UniKey on a UBS flash drive or similar device, in order to run it on any computer with minimum effort.
At initialization you can specify the start and end block, enable hexadecimal mode, include font information, as well as set the tool to pass the Space and Backspace keys, paste with simulated CTRL+V, and pop up after pasting.
The main window is plain and simple to work with, as you can view the Unicode characters for each symbol in the selected font type. You may copy characters to the Clipboard, as well as block special symbols, such as currency, mathematical, arrows, Greek, or graphics.
UniKey does not put a strain on system resources, since it runs on a very low amount of CPU and RAM. It has a good reaction speed and doesn't cause the operating system to hang, crash or pop up error dialogs. Unfortunately, the tool is not very intuitive for first-time users.