Question about a key in the ti-89

[kevinf]

i am having trouble finding out what the diamond + stor -> key do. i don't know what that symbol means

 

[kevinf]

anybody know what this key means?

 

[Danger]

Don't you have a manual for it?
If not, maybe try out the company's website help section. Personally, I've never even seen one of those devices.

 

[ranger]

I've seen the @ symbol a few times when I do certain computations. @ indicates an arbitrary integer and the TI89 manual has also given @ the name arbitrary. Here is what the TI89 manual (pg. 80; Symbolic Manipulation) had to say:

When an arbitrary
integer occurs multiple
times in the same
session, each
occurrence is numbered
consecutively. After it
reaches 255, arbitrary
integer consecutive
numbering restarts at
@n0. Use Clean Up
2:NewProb to reset to
@n1.
ˆ