625c0a5c_ns___MailChimp_com__KB_Article__Operator
[Description] When used with Automation: Subscriber has triggered an automation workflow and received at least one campaign. This will include any subscriber who triggered a workflow, even if they were later segmented out of future automated emails. When used with SurveyMonkey: Subscriber has not completed the SurveyMonkey survey you select. This includes subscribers who have not started the survey at all. [Operator] 
has not completed
All the Segmenting Options | MailChimp.com: KB Article
Operator