There is no special name for them. They are just blank cells or empty cells, or whatever you want to call them.
In a spreadsheet they are cells that have formulas in them, as opposed to blank cells or ones with values.
The cells that go across the spreadsheet horizontally is called a row of cells.
columns
The area of the screen where you interact with a spreadsheet is called the spreadsheet workspace or spreadsheet view. It is where you input, view, and manipulate data within the cells of the spreadsheet.
Cell in a spreadsheet is a part of the sheet. If it has some information in it then it is data. Else initially a new spreadsheet will be blank with rows and columns consisting of different cells like a table.
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A row.
A column.
A rectangular group of cells in a spreadsheet can be called a range or a block.
File, New, Blank workbook
They are called a row.
From the Numbers File menu select New From Template Chooser.... And then select the Blank spreadsheet template.