A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This feature is called "Array Evaluation" or "AE" as opposed to the classic "Implicit Intersection Evaluation" or "IIE". AE was introduced when Dynamic Arrays were added about a year ago, Here is a description from the perspective of VBA:
If you put an AT sign (@) in front of the entire formula but after the equal sign, it disables AE and applies IIE to the entire formula. Putting the AT sign in front of a specific range reference tells Excel to use IIE for only that range reference.
Kevin