Learn Dynamic Arrays with the Hash Operator in Excel.
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In Excel, the hash (#) sign is used to reference dynamic arrays, which automatically adjust as new data is added or removed. Dynamic arrays allow formulas to return multiple values, making them more flexible and efficient. Functions like UNIQUE, FILTER, and SEQUENCE return dynamic arrays, which can expand or contract based on the dataset. By using the hash operator after a cell reference (e.g., A1#), you can refer to the entire array generated by a dynamic formula. This makes tasks like creating dropdown lists or calculating results more seamless, as you don't need to manually adjust the range when new data is added—the array adjusts itself.

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Chapters:
0:00​ ​ Dynamic Arrays
1:47​ Hash (#) Operator
4:20​ RealWorld Example
8:03​ Dynamic DropDown List
9:25​ Tables vs Dynamic Arrays