Is this occuring when turning the wheel back and forth rapidly a small amount? The car stopped? If so while slightly annoying it's nothing to worry about. It's just one of two things. THe clock spring rattling inside the column or there is a rubber bushing that does it. If the clock spring rattling most likely a tech can tighten it. If the bushing the column requires replacement. IMO neither is worth the trouble.
If this happens only with car moving than it could be, tie rod ends, sway bar links and or bushings, steering rack, struts or some part of struts i.e. bushings, bearings, etc. or the actual strut cartridge itself. If this noise occurs with car on slightly rough street regardless of steering movement most likely culprits are the sway bar bushings and or links, or a bad strut.