A great reference for searching & finding Unicode Chars.
Here's a fantastic site with the huge range of available Unicode Chars : http://unicode-table.com/en/
Not only is there a table with all the different unicode chars and their HTML entities & codes, the site includes a list of char sets that group together chars by a topic, such as Christmas & NewYear, Hearts, Currency, Arrows etc.
There's even a great flip text tool that allows you to flip any string of chars vertically.
For example from this :
this is a test!
¡ʇsǝʇ ɐ sı sıɥʇ