Kala Velaकाल वेला
A warning that fires when a specific Choghadiya slot is extra-toxic on a specific weekday — for example, the "Udveg" slot is especially blocked on Sunday (the Sun's own day), and "Kaal" is especially severe on Saturday (Saturn's own day).
This is a stronger warning than the Choghadiya slot's ordinary "avoid new work" guidance — it means this particular combination of slot-name and weekday compounds the usual caution into something more serious. The message tells you exactly which slot, why it's worse on this weekday, and its exact time window.
Each of the 7 weekdays has one specific Choghadiya name flagged as its Kala Vela — determined by which planet rules that Choghadiya slot and how that interacts with the weekday's own ruling planet (e.g. Sunday + Udveg = Sun's own toxic slot, doubly blocked).