Adwords conversion tracking code.
https://support.google.com/adwords/answer/6095821#get_tag
Analytics and Tracking · Advertiser Tracking
Get access to data on 296,023 websites that are Google AdWords Conversion Customers. We know of 210,808 live websites using Google AdWords Conversion and an additional 85,215 sites that used Google AdWords Conversion historically and 114,985 websites in the United States.
Get a list of 296,023 websites using Google AdWords Conversion which includes location information, hosting data, contact details, 210,808 currently live websites and 85,215 sites that used this technology previously and 114,985 websites in the United States currently using Google AdWords Conversion.