What is this element on the far right of schematic described as "270 OHM"? Is this some kind of inductor? What is its purpose in this device (this is a reference design of dc-dc power supply of sim900 taken from its datasheet) and what would be an exemplary part number? 
Answer
It is a ferrite bead with a 270Ω impedance.
Ferrite beads have a number of symbols in use in schematics. There hasn't been a standardization in the symbol like for other components. Many people treat them like a simple inductor, some like a resistor, some with a special symbol they made for it. Some of the symbols seen include:
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