Die Dreierschild and the Triceps are two closely related Germanic symbols and are variants of the Valknut.
The Dreierschild (pictured to the left) is known in English as the triquetra which simply means triangle and can refer to any 3 cornered shape. In England it is often incorrectly perceived to be a 'Celtic' symbol but this is false.
"Der Dreierschild ist ebenfalls eine alte germanische Form des Dreifusses und das Zeichen fuer-die dreifache Verpflichtung, die Gott, Welt und Menschheit jedem Leben stellen-. Beim Dreipass haben wir in der Mitte des Zeichens, gebildet durch die Verschneidungen der drei Kreise, bereits den Dreierschild gesehen." (Das Buch der Deutschen Sinnzeichen, Walter Blachetta)
Wotans Krieger's translation:
"The triquetra is likewise an old Germanic form of the trefot and the sign for the threefold duty, which God, the world and mankind place on every life. With the Dreipass (Wotans Krieger's edit-an alternative form of the triquetra pictured immediately above the Dreierschild but resembling 3 interconnected circles with a Dreierschild in the centre-a form of trefoil) we have already seen in the middle of the sign the triquetra portrayed through the blending of the three circles."
Regarding the triceps:
"The triceps, an old Nordic sign. A symbol of heavenly power. By tracing its perimeter from the apex back to the apex we realise the meaning of the words: 'The Will of God, descending upon the world, sways to and fro over the Earth, and returns again on high." (The Book of Signs, Rudolf Koch)
The triceps (pictured at the top) consists of three connected Common Germanic connected Ing runes. The image of the Dreierschild attached to this article is the Wappen (coat of arms of Hohberg in Germany.