To be honest I think you just have to try, it appears to be different in every ESP. This is how I added one...
First thing to do is find the Unicode symbol you want to use. Go to all programs, Accessories, System tools, character map.
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Once in the character map choose Arial Unicode MS and choose your character.
In the above example I have chosen a heart, you can see the character and at the bottom the character code U+2764.
Try copy and pasting the heart into your subject line and send a test, if not try and type the code into the subject and send a test.
I use Silverpop and I had to us an email encoder to get the Unicode symbol to display. I visited this link and pasted in the heart character along with my subject line text. http://cs.silverpop.com/encoder/wizard.php
Result:
=?utf-8?B?4pmlIGhhcHB5IHZhbGVudGluZXMgZGF5?=
Display Example:
♥ happy valentines day
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