The key.
It is a Breakout board for the ESP8266, with the shape of a key, which can be used as a badge.
This is an Alpha version of the PCB and may contain errors that cause it to not work properly, feel free to do all the modifications you like and your wish to share what you change.
The design is based on the product Adafruit Huzzah, and this company owns all the rights of this design.