The mentioned calculator is not sold anymore.
When you like to use (greek) scientific symbols on your Casio FX880P, you can do that in 2 ways. You can use one of the codes from the table below in your (basic) programm, for instance CHR$(136).
You also can use the symbol directly.
1) First you have to close the programm which you was editing.
2) Enter the code and press enter (EXE).
3) Press the IN button from the Function Memory.
4) Open the programm and place the cursor on the place where you want to insert the symbol.
5) Press the OUT button from the Function Memory.
A summary of usable symbols is in the table below.
| Symbol | Stand for | Casio CHR$ |
| α | Alpha | (136) |
| β | Beta | (137) |
| ε | Epsilon | (139) |
| γ | Gamma | (138) |
| º | degrees | (223) |
| μ | Mu | (141) |
| π | Pi | (231) |
| ∫ | Integral | (129) |
| √ | Root | (130) |
| { | Accolade open | (123) |
| } | Accolade close | (125) |
| ¹,²,³, | Square | (145) - (153) |
| σ | Sigma | (132) |