They look like a typo, but they’re the reason your table formulas don’t break.

Double square brackets appear in structured references in Excel when column headers contain spaces or special characters. They're also inserted into formulas when you reference header and total rows ...

Have you ever carefully crafted a formula in Excel, only to watch it unravel into chaos the moment you copy it across columns? It’s a maddening quirk of Excel tables—structured references that seem to ...