What Does It Do ?This function is a place marker used to indicate that required information is Not Available.
It can be type directly in to a cell as =NA() or it can be used as part of a calculation.
When the =NA() is used, any calculations which depend upon the cell will also show #NA.
It is used to indicate that all the data has not yet been entered in to the spreadsheet.

Syntax=NA()

Formatting
No special formatting is required.

Example
The following table was used by a company to calculate the monthly Wage of an employee.
The Salary and Tax percentage are entered.
The Tax is then deducted from the Salary to calculate the Wage.

Table 1 shows that when the Tax is not entered, the Wage is still calculated.
On a large spreadsheet this may go unnoticed and the wrong Wage paid.

Table 2 shows how the =NA() has been inserted in the unknown Tax to act as a
reminder that the Tax still needs to be entered.