Arduino is a Italian word name mean " strong friend ".
The Arduino project was started at the Interaction Design Institute Ivrea (IDII) in Ivrea, Italy. At that time, the students used a BASIC Stamp microcontroller at a cost of $50, a considerable expense for many students. The project goal was to create simple, low cost tools for creating digital projects by non-engineers. The Wiring platform consisted of a printed circuit board (PCB) with an ATmega168 microcontroller, an IDE based on Processing and library functions to easily program the microcontroller. The initial Arduino core team consisted of Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, and David Mellis. In early 2008, the five co-founders of the Arduino project created a company, Arduino LLC .
Arduino is open-source hardware. Most Arduino boards consist of an Atmel 8-bit AVR microcontroller (ATmega8,[24] ATmega168, ATmega328, ATmega1280, ATmega2560)
The Arduino Single-Sided Serial Board information available on internet is from version 2: The initial design of the single-sided board (labeled version 2 because it was derived from v. 2 of the serial board). Requires six bridges. Has a 1K resistor (but no LED) on pin 13. The ICSP header location is not compatible with other boards.
The third version of the single-sided board. It has fewer bridges (three) than the original and includes TX, RX, and pin 13 LEDs. 
This is the third revision of the board: the Arduino Single-Sided Serial version 3, or s3v3, or Arduino Severino. It was designed by Adilson Akashi, based on the previous version.
A4 Image for Toner Transfer (.png)
Reference :
1) https://en.wikipedia.org/wiki/Arduino
2) https://www.arduino.cc/en/Main/ArduinoBoardSerialSingleSided3
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