LToolsC0i corresponds to the C0i function in LoopTools. The only difference is that the id should be entered as a string, e.g. "c0" instead of c0.
LToolsC0i
C0i
id
"c0"
c0
See ?LoopTools`C0i for further information regarding this LoopTools symbol.
?LoopTools`C0i
Overview.