HP 35s Scientific Calculator - Manual (Page 19)

Getting Started 1-3
Pressing  or  turns on the corresponding or  annunciator symbol at
the top of the display. The annunciator remains on until you press the next key. To
cancel a shift key (and turn off its annunciator), press the same shift key again.
Alpha Keys
Most keys display a letter in their bottom right corner, as shown above. Whenever
you need to type a letter (for example, a variable or a program label), the A..Z
annunciator appears in the display, indicating that the alpha keys are
“active”.
Variables are covered in chapter 3; labels are covered in chapter 13.
Cursor Keys
Each of the four cursor direction keys is marked with an arrow. In this text we will
use the graphics
Х , Ц , Ч and Ø to refer to these keys.
Left-shifted
function
Right-shifted
function
Letter for alphabetic
key