=T(value)
=T("NASA")
The T function is a text function that is used to convert any value or text string into a text value. If a value is passed into the T function, it will return the same value in text format. An example is this formula, which will return "NASA".
=T(100)
If a numerical value is passed into the T function, it will return an empty string, such as above, which will return "".
The T function is a useful tool for testing whether a given value is text, as it returns the text referenced by that value.