What is this?

There are many different Arduino microcontroller boards. Here the pinouts of the most popular.

Adafruit Feather 32u4 Basic Proto pinout

Adafruit Feather 32u4 Basic Proto pinout.

Version 2.1

Fishino

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Fishino UNO is based on Arduino platform, keeping all of its features and adding new ones.
This guarantees that all Arduino’s shields and libraries will work with no changes on Fishino UNO.

More info here.

Version 1.1

Lilypad USB

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Lilypad USB pinout

Lilypad SimpleSnap

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Lilypad SimpleSnap pinout

Lilypad Simple

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Arduino Lilypad Simple pinout

LilyPad

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Arduino LilyPad pinout

Fio

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Arduino Fio pinout

Ethernet

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Arduino Ethernet pinout

Esplora

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Arduino Esplora pinout

Micro

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Arduino Micro pinout