— How does a spaceflight company celebrate going public? With a mission patch and a (rocket engine) bell, of course.

SpaceX on Friday (June 12) offered the new collectibles on the same day that its long-anticipated IPO (initial public offering) became the largest ever in history. Founder Elon Musk is now the world's first trillionaire and more than 4,400 of his current and former employees are estimated to be millionaires.

Shares in the company closed at $160.95, up 19% on the Nasdaq Stock Market.

Or, you can order a "SPCX Liftoff" mission patch from the company's shop for $15.

"Celebrate the liftoff of SPCX! The Future is Public!" reads the company's description of the black, white and silver embroidered emblem. The patch features a depiction of SpaceX's Starship spacecraft and includes a small four-leaf clover, the same as on every SpaceX flight insignia since its first successful launch.

SpaceX also released a "The Future is Public" t-shirt ($35), a "SPCX" adjustable cap ($40) and a "I Love SPCX" tote bag ($45) with the "love" being denoted by a Martian surface-red heart.

Perhaps the most unexpected offering is a 7-inch (18-cm) SpaceX Raptor Bell that really rings. The $125 desktop bell is modeled to look like the engine that powers SpaceX's Starship and Super Heavy launch vehicle.

Like the rocket engine, the bell is still under development with orders expected to ship in December. The final version may vary slightly in appearance, material or color, according to SpaceX.

On Friday, Elon Musk was at SpaceX's Starbase industrial complex and launch facility in Texas for the ringing of the Nasdaq opening bell in New York, where other company officials had gathered. He had one of the scale Raptor bells on a desk beside him.

"It is hard to believe that a little company that started in a warehouse in El Segundo [California] is now going public with the largest IPO ever," said Musk. "Because I thought this company was going to fail. I gave SpaceX less than a 10 percent chance of succeeding at all and I told people it is probably going to fail but we should give it a try because if there is not a new company that enters space, we will never truly be a spacefaring civilization."

"The other aerospace companies... they were simply not pursuing the technology to make life interplanetary," he said.