Data sheet inductance (R/A ?)
It's an EMI suppression chip ferrite bead. Their inductance is often expressed as a resistance value at a certain (high) frequency. The 600\$\Omega\$ mentioned may be at 100MHz, for instance. This frequency should have been mentioned in the schematic. Let's say it's specified at 100MHz, then since


  \$ |Z| = 2 \pi f L\$


L = 1\$\mu\$H at 100MHz. Why they don't simply give the 1\$\mu\$H value? That's because the inductance is frequency dependent, as illustrated in the following graph from Murata's BLM18 series chip ferrite bead datasheet:

  

edit
It doesn't look like a coil (more like a resistor) because the coil is actually inside the ferrite:  

  

The picture below is an X-ray image of the coil inside the ferrite. This gives an idea of how thin the coil is, which explains the maximum current (in our case 0.5A).