This red "up arrow" displays next to items in the Jobs page under "picked" and indicates... ??
Note: as in this screenshot, this text will often wrap onto two lines if your screen size is smaller than 2209px wide (Mac/Chrome)
These orange arrows indicate that some quantity from the operation is being reworked. When you rework any items through job tracker, it creates another operation step to be completed
This red exclamation indicates that a job is "Late" (Still open past its Production Due Date). When looking at the individual jobs page or on job tracker, you will also see a red "Late" flag