Arduino Leonardo is a lower cost Arduino, but with enhanced capability. The lower cost comes from the use of the ATmega32u4, which has a USB core built in (eliminating one chip out of the board). Very likely it was inspired by Teensy In addition, compared to the "regular" Arduino it has the following enhancements: Extra…
Arduino Leonardo with Headers — Arduino Official Store
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Arduino - Wikipedia
Arduino Leonardo H i F i D U I N O
The duinoCase-AL is designed to hold a standard Arduino Leonardo board, and one shield. Based on our Universal v3 enclosure design, there are
duinoCase–AL (for Arduino Leonardo)
Arduino Leonardo with Headers [A000057]
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Using the Audio TinyShield Tutorial
Iduino Yun Cloud - Geeetech Wiki