Unfortunately there is no way to make a "range" reference to the same cell across multiple sheets like you can with Excel.
If you are looking to sum up a relatively small number of cells across a number of sheets, one way is to create a new table that draws in the data from those sheets so it is all in one table. Below is an example.

Row 1 and column A are headers. Last row is a footer.
Formula in cell B2 =IFERROR(INDIRECT($A2&"::"&B$1),"")
Fill down and across to complete the table
Formula in B16 = SUM(B)
As you can see, I currently have only 3 data sheets. The rest of the sheet names in the table are for future use. Those rows will fill in as you create new sheets with those names. At least that is what is supposed to happen. I believe I recall a recent bug where it wouldn't always update the summary table as it should but it seems to be working now as best I can tell.
This can be used to aggregate as many cells as you want from the sheets but it takes one column per cell so it gets a little unwieldy after a while.