Solution 13660: Using Greek Symbols In Programming Scripts On the TI-83 Family, TI-84 Plus Family, Or TI-Nspire™ Handheld In TI-84 Plus Mode.
Can Greek symbols be used when creating programs for the TI-83 family, TI-84 Plus family, or TI-Nspire handheld in TI-84 Plus mode?
The TI-83 family, TI-84 Plus family, or TI-Nspire handheld in TI-84 Plus mode 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-83 family and TI-84 Plus family guidebooks for additional information.
Please Note: TI-Nspire users may refer to the TI-84 Plus family guidebook.