Come take my flourine

The above figure shows the tetramer of $SbF_{5}$ . Each signal in a F-NMR represents a different chemical environment that fluorine can be placed in.

There exist 3 unique types of environments in the $SbF_{5}$ tetramer :

• At axial positions (8 of such exist)
• At equatorial positions (4 of such exist)
• At bridging positions (4 of such exist)

Therefore the number of signals obtained is $\boxed{3}$

(image from wikipedia)