Cr0
From Market Ruler Help
cr0 is the Query String variable configured to capture the inbound Campaign for an advertising campaign.
cr0 is one of the indexed query strings and allows for up to 8 different landing dimensions to be recorded using query strings which are indexed from 0 to 7.
Common synonyms can be also used:
-
crcategory -
crcat -
c1(Legacy)
When it appears in a URL:
https://www.example.com?cr0=PPC