The fill handle is the small black square located in the lower-right corner of the heavy around the active cell.
What is Fill handle?
In Excel, the fill handle feature allows you to extend (and fill) a list of numbers, dates, or even text to a specified number of cells.
The fill handle in the spreadsheet's active cell is shown by a little black box in the bottom right corner.
The fill handle can be used to copy (fill) data to subsequent cells in the same row or column. It is the small bold square in the bottom right corner of a cell.
The mouse pointer will turn into a black + symbol as you move your cursor over the fill handle box. Next, choose the adjacent cells you want to copy to by clicking and holding down the left mouse button.
The content will then fill after you let go of the mouse button.
Hence, the correct answer is Fill handle.
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