I am working on a senior design project and am trying to embed an ATSAM3X8E ([Here is the Application Sheet PDF](http://www.atmel.com/Images/Atmel-42187-ATSAM3X-and-ATSAM3A-Series-Checklist_AP-Note_AT03462.pdf)) micro-controller into a system my team is designing. What is the pourpose of incorperating an inductor into the VDDUTMI (USB 3-3.6V input) and the VDDANA (for ADC and DAC supplies) ? I konw as a senior I should probably know this, but a little help is welcome.

Also, for the number 2 red circle, is that a symbol for a polarized capacitor? I am not used to this representation. 

EDIT: Also, why is there no value for the resistor?? What does 1R mean? 

(This above schematic can be found on page 4 of the application note file.)

![enter image description here](https://i.stack.imgur.com/L6xWs.png)