Important! LINK.
This is what a wire-OR gate is. No, it’s not just wire together, the official circuit uses diodes to prevent signal back-flow, and a pull-down resistor to keep the voltage/current regulated.
JJJ TODO LINK with DTL and RTL articles.
20180508/DuckDuckGo wire-OR
20180508/https://en.wikipedia.org/wiki/Wired_logic_connection
Important! For GPIO on the Raspberry Pi. Wondering where the names pull-up and pull-down for the GPIO state configuration are derived? Look here, this is the reason why.
20180508/https://en.wikipedia.org/wiki/Pull-up_resistor
- Of course, as many commentators have stated on this, modern users are far displaced from the concept of pull-up and pull-down.