Solution 13660: Using Greek Symbols In Programming Scripts on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.
...ables. 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.Greek symbols are used in some system variables. For example, lowercase sigma is used as part of the system variable ...https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/13660
Solution 34811: Deleting programs on the TI-83 Plus and TI-84 Plus family of graphing calculators.
...) Scroll down through the list of options and highlight option [7:Prgm] and then press the [Enter] key. 4) Move the cursor next to the program you wish to delete. 5) Next press the [DEL] key then highlight [2:Yes] and then press the [Enter] key. 6) Once the program has been deleted, press the ...https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/34811