I can not tell by that picture... but it is the round rod which goes from the back of the tire lower area , attaching below the coil spring, and to the lower arm carrying your spindle... and goes back to under the firewall area and has a large... like four inch bushing.. this rod is almost in the same line with the longitutinal axis of the car.. ( fore-aft )...
In the old days it was called the Track Rod... but younger people often call it a " control arm ' these days...