•Core-dominant sources are seen jet-on, have flat radio spectra, and are variable, optically polarized and beamed.
•Lobe-dominant
sources are not very variable, have steep radio spectra dominated by optically thin synchrotron emission, and are not beamed strongly.
•Can measure orientation by various methods, e.g., LogR* = core/lobe radio flux at 5 GHz rest-frame (Orr & Browne 1982), also Rv which normalizes core flux with an optical magnitude (Wills and Brotherton 1995).