====== Number to Letters (Expression Function) ======

===== Purpose =====
The **Number to Letters** function (NUMBER_TO_LETTERS) returns capitalized latin characters that correspond to the number starting with 0. 

{{::number_to_letters_initial.png?direct&600|}}
===== Parameters =====
The **Number to Letters** function has one required parameter:

==== String ====

Allowed Inputs: [[Field|field]] value or positive number

Either use the use the [[Query Builder]] to choose a field that contains a positive number or use type a value to enter a positive number.  While it is technically possible to use a text string with this function it is not recommended.

===== Output =====

The output of the **Number to Letters** function is a string of capitalized latin characters corresponding to the number entered starting with 0 = A. A negative number will result in an empty string.
===== Example =====

This function can be useful when creating simple alphabetic identifiers.  For example the result of NUMBER_TO_LETTERS(0) is "A", the result of NUMBER_TO_LETTERS(25) is "Z", and the result of NUMBER_TO_LETTERS(30) would be "AE".