Clarifying line-to-line versus phase voltage of 3-phase rectifiers
Typically "Y" or "Wye" or "Star"  Vac= Phase to Neutral to end-user

Delta has no Neutral with 3 wires so Vac = Phase to Phase or "line to line"

But then if you knew how to learn with simple keywords, you could have found this answer on your own.  https://blog.teledynelecroy.com/2018/03/more-basics-of-three-phase-ac.html