Parece que você está olhando para uma folha com uma tabela. Dê uma olhada em página da Microsoft explicando referências estruturadas dentro de tabelas.
Para evitar a perda de links, veja os destaques:
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║ This item: ║ Refers to: ║
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║ #All ║ The entire table, including column headers, data, and totals (if any). ║
║ #Data ║ Just the data rows. ║
║ #Headers ║ Just the header row. ║
║ #Totals ║ Just the total row. If none exists, then it returns null. ║
║ ║ ║
║ #This Row ║ Just the cells in the same row as the formula. ║
║ or ║ These specifiers can’t be combined with any other special item specifiers. ║
║ @ ║ Use them to force implicit intersection behavior for the reference or to ║
║ or ║ override implicit intersection behavior and refer to single values from a ║
║ @[Column Name] ║ column. Excel automatically changes #This Row specifiers to the shorter @ ║
║ ║ specifier in tables that have more than one row of data. But if your table ║
║ ║ has only one row, Excel doesn’t replace the #This Row specifier, which may ║
║ ║ cause unexpected calculation results when you add more rows. To avoid ║
║ ║ calculation problems, make sure you enter multiple rows in your table before ║
║ ║ you enter any structured reference formulas. ║
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