Carryover
Work committed to a sprint that isn't finished when the sprint ends and rolls into the next one. Occasional carryover is normal; chronic carryover signals over-commitment, unclear acceptance criteria, or hidden dependencies. Healthy teams measure it and treat a rising trend as a planning problem to diagnose, not an effort problem to push through.
Carryover is a planning smell, not a sin: a little is normal, but a sprint that consistently carries a third of its work over is over-committing, mis-estimating, or being interrupted more than it admits. The fix is rarely "work harder", it's smaller stories, a realistic capacity number, and an explicit interrupt buffer. Tracking carryover as a trend, rather than a per-sprint number, is what turns it from a guilt metric into a signal about how predictable the team actually is.