The 1979 1-cent seen here is a product of "die-deterioration doubling". The word "doubling" in this case refers to the doubling-effect of the date, and not necessarily meaning "twice" versus "thrice". The doubling effect occurs in multiple trajectories, as the die continues to deteriorate.
That said, both CCCS and ICCS have called variations of these coins "tripled". But, unlike a triple punched 9 in the 1859 large cent or a tripled-hub 1882H large cent, the 1979 cent was neither hubbed multiple times, nor were the dates punched in by hand into a matrix die, nor was there any re-engraving of the master or working dies. Call it whatever you want - tripled date, fat date, or rimmed numbers - the cause of what you see is " Die Deterioration Doubling".
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