Amazon.com: 2 x 20 (40 Pin) Extra Tall Female 0.1 Inch Pitch Stacking Header Compatible with Raspberry Pi A+/B+/Pi 2/Pi 3 Extra Tall Header (Pack of 8) : Electronics
36-pin Stacking header - pack of 5! : ID 3366 : $5.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Multiple Connector Alignment On Mating PCBs - The Samtec Blog
electrical - Looking for vehicle that uses this 3-pin connector - Motor Vehicle Maintenance & Repair Stack Exchange
Using Board Stacking Connectors in Industrial Applications - The Samtec Blog
Flexible Board Stacking Connectors | Samtec
Bottom Entry Sockets | Products | GradConn
10pcs/lot Triple Stack Earphone Jack Connector for Desktop Headphone MIC Jack 3 IN 1 Audio Port 13 pin|connector|connector jackconnector audio - AliExpress
40pin Gpio Connector 2x20-pin(40pin) Extra Tall Female Stacking Header For Raspberry Pi A+ Pi Model B+ Pi 2 3 4b W/ Acrylic Base - Pc Hardware Cables & Adapters - AliExpress
1 Piece 2.54 Mm 40 Pin Female Stacking Header Connector Dual Row 2x20 Position For Raspberry Pi 2 Mode B& B+ Pc104 - Connectors - AliExpress