Variables not created in statistics

[math7]

No, the calculator does not save those variables. If instead of C1 in the column I type TIME and in column C2 I write DISTANCE, the variables TIME and DISTANCE do not appear as variables in any menu of the Prime. There are no pictures in the VAR system variable menu or in the function and command catalog of the calculator. I have attached images where they are not displayed. If I had 50 variables created how could I remember what they are to use the full name as DrD says?