Texas Instruments TI-83 PLUS - Manual (Page 8)

TI-83 Plus Operating the TI-83 Plus Silver Edition 5
The alpha function of each key is printed in green above the key. When
you press the green
ƒ key, the alpha character printed in green
above the other keys becomes active for the next keystroke. For
example, when you press
ƒ and then  , the letter A is entered.
This guidebook describes this keystroke combination as ƒ [
A
].
The y key
accesses the
second function
printed in yellow
above each key.
The ƒ key
accesses the alpha
function printed in
green above each
key.