Inspect unicode characters associated with an icon font
Put the icon font you want to inspect in the fonts/ directory (replacing the existing fonts -- which means you'd rename your font files in the process), then run a web server (e.g. with python -m SimpleHTTPServer on the command line from the folder containing index.html).
When you view your index.html in the browser it'll output something similar to this.
Based on 'Parsing Iconfont Characters Automatically' by Anselm Hannemann (@anselmh) See also the jsbin code.
I've also included the open source web font from @erikflowers's weather-icons project as an example font (this is a change from @anselmh's jsbin).