They are like -_, but way bigger? I tried &l_-, but it does not quite look like this! This was on the Minecraft superior gaming server, but it is also on Sky Supreme Games! Help!
You can copy these characters from e.g. websites with special character tables and paste them in the mc chat / config file with ctrl-v, or you type them in by holding the alt-key and typing 3 numbers on the numpad. For this upper "flag" it's alt+ 223, for the lower "flag" it's alt + 220 Here are some more of them: http://www.tedmontgomery.com/tutorial/altchrc.html