A "promotional tool" refers to a method or object used to advertise a product, service, or event. It helps attract attention, create awareness, and persuade people to take action such as making a purchase or attending an event. Full definition
Similar and related words and phrases are presented below.
But why did t - shirts suddenly start being used as promotional tools? (theidleman.com)
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This new promotional tool became a key part of the author's and publisher's marketing campaigns as the decade progressed. (theliteraryplatform.com)