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Wiktionary
point of contact

n. 1 The single person who represents an organization, for a specific task. 2 (context computing English) A person who is associated with a defined Internet entity. 3 (context scientific English) A specific intersection; a contact point.

Wikipedia
Point of contact

A point of contact (POC) or single point of contact (SPOC) is a person or a department serving as the coordinator or focal point of information concerning an activity or program. A POC is used in many cases where information is time-sensitive and accuracy is important. For example, they are used in Whois databases.