Raspberry Pi Pico to Arduino Uno adapter relies on FlexyPins for castellated holes - CNX Software

Solder Party's "Raspberry Pi Pico to Uno FlexyPin Adapter" uses FlexyPins to secure the Pico board to the adapter using its castellated holes.

Raspberry Pi Pico to Uno FlexyPin Adapter by Solder Party

ClipZin PCB connector review — The MagPi magazine

Raspberry Pi Pico FlexyPin Breadboard Adapter by Solder Party

Surface-mount connectors hold castellated modules

Adapter Board for Arduino & Raspberry Pi

CNX Software - Embedded Systems News

Raspberry Pi Pico to Arduino Uno adapter relies on FlexyPins for castellated holes - CNX Software

Raspberry Pi Pico to Arduino Uno adapter relies on FlexyPins for castellated holes - CNX Software

These boards allow you to use various modules with a breadboard (and more) without having to solder the module in place. Just add FlexyPins!

FlexyPin Adapter - M5Stamp Pico

200mm Sensor Extension Cable for Raspberry Pi Camera Module V2/V3, Support Working on Raspberry Pi and Jetson Nano - Arducam

Raspberry Pi Pico to Uno FlexyPin Adapter by Solder Party