Call to Action.

In marketing, a call to action (CTA) is an instruction to the audience to provoke an immediate response, usually using an imperative verb such as “call now”, “find out more” or “visit a store today”.

Call to action (marketing)Wikipedia
10 techniques for an effective call to actionBoagworld
30 Call-to-Action Examples You Can't Help But ClickHubSpot
21 Call to Action Examples and 3 Rules for Effective CTAsThe Daily Egg
Call to Action Phrases That Will ConvertSprout Social
Writing empty statesUX CollectiveFebruary 16th, 2018