Zoro's usual three sword style moves start with
三刀流 (Santoryu/ lit. Three swords style) , then followed by the name of his technique.
Example
"三刀流...極虎狩り!!!"
Three swords style: Ultra tiger hunt!!!
For other styles, 三 is replaced by the number of swords.
One sword style is Ittoryu aka 一刀流
Two swords style is Nitoryu aka ニ刀流
Nine swords style is Kyuttoryu aka 九刀流
But apparently Zoro has a new style that starts with
閻王, like
閻王 三刀流 (En-ō santoryu)
Since 王 kanji is used for conqueror haki (覇
王色の覇気/
Haō-shoku no Haki) . I guess this is about advCOC
Basicallt King didnt lose to santoryu. He lost to en-ō sentoryu