I mean, this goes back to pre-computer versions of this on ledgers, where people would fill in a horizontal bar from left to right to show how much of a task they had completed at a factory.
Pojavila se u raznim oblicima i prije samih računala kad su ljudi u poslovnim knjigama ispunjavali traku s lijeva nadesno kako bi prikazali količinu odrađenih zadataka u tvornici.