Why cannot name a function A1 or NA77?
 

Why cannot name a function A1 or NA77?

Then a call to these functions is unable to find their definitions and
a #REF! is returned.

What's the problem?

Why cannot name a function A1 or NA77?
 

think about it.
= A1
returns what? the value in A1 or the value from your function? adding
ambiguity is definitley not a good thing. For the same reason you should
never use variable names that are the same as keywords in the language.

"vsoler" wrote:

Why cannot name a function A1 or NA77?

Then a call to these functions is unable to find their definitions and
a #REF! is returned.

What's the problem?