The Harbingers primarily wear blue Power Armour, which includes the helm, power pack, torso, groin and shoulder plate trim. The shoulder plates, arms and legs are yellow. The black squad specialty symbol -- Tactical, Assault, Devastator or Veteran -- is located on the right shoulder plate. A yellow Roman numeral is centred on the squad specialty symbol, indicating squad number. The colour of the Aquila or Imperialis on the chest plate indicates company number in accordance to the Codex Astartes -- i.e. White (1st Company), Yellow (2nd Company), Red (3rd Company), etc.
The Harbingers' Chapter badge is a large ebon sword, pointing diagonally to the left and downwards, with a beaming halo surrounding it, centred on a field of yellow.
- Adeptus Astartes: Successor Chapters (Limited Release Booklet), pg. 50