How to use a symbol character in prefix of in text citation?

You can copy and paste the delta character into MS Word first, then copy the delta character from MS Word into the EndNote “Prefix” field. The following was tested with MS Word 2010 and EndNote X6.0.1

Refer to attached image for illustration of  steps #1 and 2:

  1. The delta character can be generated by either copying and pasting the symbol from Windows “Character Map” or using the unicode coding U+0394. The main issue is to first copy and paste the delta character into MS Word; then

  2. Copy and paste the delta symbol from MS Word into the EndNote “Prefix” field. The delta character is displayed in the citation and appears to “stay put” when updating the citations/bibliography.