What was the call sign of the Apollo 9 command module?

What was the call sign of the Apollo 9 command module? It was Gumdrop.

Apollo 9 launched on March 3, 1969, to test the lunar module and the equipment needed for a future Moon landing while in Earth orbit. Commander James McDivitt, command module pilot David Scott, and lunar module pilot Rusty Schweickart spent ten days testing the spacecraft systems.

Gumdrop was the call sign of Apollo 9’s command module, while the lunar module was called Spider. The names were informal crew-selected call signs used in communications after the spacecraft separated. Gumdrop’s rounded, candy-like appearance likely inspired its nickname.

Apollo 9 was a crucial bridge between Apollo 8’s lunar-orbit mission and Apollo 10’s lunar landing rehearsal. The crew demonstrated lunar-module flight, docking, propulsion, and life-support operations. A frequent mix-up is assigning Spider to the command module; Spider belonged to the lunar module.