Solution 34888: Using Greek Symbols In Programming Scripts On the TI-84 Plus C Silver Edition Graphing Calculator.
Can Greek symbols be used when creating programs for the TI-84 Plus C Silver Edition?
The TI-84 Plus C Silver Edition only supports single letter alphabetical characters (A-Z) as programming variables.
There is not a way to add the Greek symbols to the list. Greek symbols will have to be replaced with a letter (A-Z) so the calculator can recognize it as a program variable.
Please see the TI-84 Plus C Silver Edition guidebook for additional information.