Hi demon,
you probably need Vlookup or the Index/Match combination. If your off-screen list is organised like this:
then you can use
=vlookup(A1,X1:Y50,2,False)
where A1 is the cell where the user types the acronym and X1:Y50 is the table as indicated above.
if the list is the other way round, like
you may want to try something like
=index(X1:X50,match(a1,Y1:Y100,0))
Instead of letting the user type the acronym, you can use data validation with the list option so they can only enter values on the list. This will avoid data entry errors and make life a bit easier.
hth
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