Democratic presidential hopeful Andrew Yang took to the stage at Tuesday night’s debate with an unusual lapel pin.

It said simply, “MATH.”

Yang has worn the pin for various media appearances before, and even sells it on his website to raise campaign funds.

“We need to do the opposite of much of what we’re doing right now, and the opposite of Donald Trump is an Asian man who likes math,” Yang cracked at the debate in July.

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But while he does love math and is fond of breaking out numbers at his events, the pin also stands for something else: “Make America Think Harder.”

On Twitter, the “MATH” pin got more attention than some of the comments by the candidates:

Say what you want about @AndrewYang not wearing a tie, I LOVE how he's wearing a MATH pin on his lapel instead of the typical American flag. That has always annoyed me how candidates feel they have to advertise the stars and stripes to get elected. #DemDebate#DemocraticDebate — Scott Santens🧢 (@scottsantens) October 16, 2019

Does Andrew Yang's lapel pin really say math? #DemocraticDebate — Jo Kaur (@SikhFeminist) October 16, 2019

#yang gets it. he knows when he hits a solid line and ends his time without going over. also, he doesn’t risk losing his closer being drowned out by speaking over the moderator.

plus that math pin 🔥🔥🔥#YangGang#DemDebates — Nic Nemeth (@HEELZiggler) October 16, 2019

Andrew Yang is wearing a pin that just says ‘Math’ and honestly that gives me extreme amounts of anxiety 🙃 — Ashley Green (@agreenphotog) October 16, 2019

Andrew Yang "MATH" pin deserves more attention — Chris Cillizza (@CillizzaCNN) October 16, 2019

Andrew Yang is wearing a "Math" pin as he courts the hard to reach "Math nerd" voting bloc #DemocraticDebate — (((DeanObeidallah))) (@DeanObeidallah) October 16, 2019

Yang: "Math"



Warren: "Data"



Now we just need a candidate whose slogan is "Econometrics" and we'll have a first year grad school curriculum — Noah Smith 🐇 (@Noahpinion) October 16, 2019

Andrew Yang is wearing a "math" pin. I assume he's trolling Donald Trump, who can't do math. The difficulty: Donald Trump can't read the pin, because he also can't read. — Palmer Report (@PalmerReport) October 16, 2019

I like Andrew Yang’s math pin. I feel all the candidates should have a pin with their favorite word on it. Mine would be either LIGHTSABER or MARTINI. #DemDebatepic.twitter.com/6LyDknth8k — Joseph Scrimshaw (@JosephScrimshaw) October 16, 2019

the highlight of the debate so far has obviously been Andrew Yang’s “math” lapel pin — Alexandra DeSanctis (@xan_desanctis) October 16, 2019

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This article originally appeared on HuffPost.