The Denny’s where Nvidia was born has already removed the sign honoring the company

A plaque that read "THE BOOTH THAT LAUNCHED A $1 TRILLION COMPANY" and "Congratulations, NVIDIA! Who knew that an idea started here would change the world?" has been removed from the San Jose Denny's where Nvidia was conceived, leaving chipped red paint on the wall behind the booth. Two employees told NBC News the plaque was gone by Friday, the day after Huang resigned as president, CEO, and board member following 33 years at the helm.

Huang, 63, stepped down Thursday after reports of multiple extramarital relationships surfaced. The New York Times first reported on Wednesday a second affair between Huang and Nvidia's vice president of health care, Kimberly Powell, 48, who reports directly to him. On Sunday, Huang admitted in a company-wide email to an affair with Alice Huang (no relation), a former executive at the Singapore-based data center firm Megaspeed. "I was unfaithful to my wife," he wrote. "My actions hurt her and our children. There is no excuse for what I did. I am deeply sorry."

U.S. intelligence agencies believe Alice Huang, who started as a television reporter for China's state media before shifting into finance and video game work, may have been a spy. The FBI has opened a probe into the matter, and Nvidia's board initiated an independent investigation. Huang has been married to his wife, Lori, since 1985; they met while studying engineering at Oregon State University and have two children, Spencer, 35, and Madison, 34, both of whom work for Nvidia.

Chief financial officer and executive vice president Colette Kress was named interim CEO. Nvidia's stock price tumbled following the reports and resignation, with shares closing at $162.85 on Friday, marking a drop of more than 30 percent from their recent October peak and wiping out hundreds of billions in market capitalization.

Before founding Nvidia, Huang washed dishes and served tables at a Denny's in Portland as a teenager. Years later, he and two friends dreamt up the company over coffee and pancakes at the San Jose location. The plaque's swift removal marks a striking erasure of the origin story that had been celebrated at the roadside diner.