Answer
The answer, MATH Hats, is a reference to Yang's campaign slogan, "Make America Think Harder." During his campaign, Andrew Yang often used hats embroidered with the slogan "MATH" as a way to convey his central policy proposals and key message of data-driven decision-making and evidence-based policy. The hats served as a visual representation of his campaign's focus on tackling complex societal challenges through rational thinking and analytical approaches.