Get those digits. Reactive: Displays your number of eliminations in the match.
Tabulator backpack is a Rare Fortnite BackBling. Is Part of the Calculator Crew set.
This backbling was added at Fortnite Battle Royale on 3 April 2019 (Chapter 1 Season 7 Patch 8.20-CU).
Backbling Tabulator is reactive:
It changes or evolves (reacts) when something happens in the game. Actions such as causing damage, opening chests, ... or conditions such as whether it is day or night, for example.
The Set Calculator Crew contains 7 cosmetic items.
The back bling Tabulator belongs to Chapter 1 Season 7. It's not yet known how to get the cosmetic Tabulator.