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The symbolism for the triangle is described in the entry in the symbol section found by using the link. 

Pictish stones were used as signposts.  They described in pictures the sacred site to which the pilgrim was being directed, they gave directions in which it was to be found and they gave the constellations that could be used for navigation by the stars.  Every constellation has a symbol and each picture of the symbol then maps onto the constellation.  

Many stones contain the symbol of a triangle.  As an example six class 1 stones were found in Strathlethan Bay near Stonehaven.  Five of the stones were taken to Banchory House near Aberdeen, two of the stones use the triangle symbol.

Triangulum the Northern triangle

Triangulum is a small constellation in the northern sky. Its name is Latin for "triangle", derived from its three brightest stars, which form a long and narrow triangle. Known to the ancient Babylonians and Greeks, Triangulum was one of the 48 constellations listed by the 2nd century astronomer Ptolemy. The celestial cartographers Johann Bayer and John Flamsteed catalogued the constellation's stars, giving six of them Bayer designations.

The white stars Beta and Gamma Trianguli, of apparent magnitudes 3.00 and 4.00, respectively, form the base of the triangle and the yellow-white Alpha Trianguli, of magnitude 3.41, the apex. Iota Trianguli is a notable double star system, and there are three star systems with known planets located in Triangulum. The constellation contains several galaxies, the brightest and nearest of which is the Triangulum Galaxy or Messier 33—a member of the Local Group. The first quasar ever observed, 3C 48, also lies within Triangulum's boundaries.