Amazing!... The Original Seal of the "United Religious and Military Orders of the Temple, and of St. John of Jerusalem, Palestine, Rhodes and Malta" a.k.a "The High Knight Templar Freemasonic Degree" of the Rite of York, consisted of a triangle with the IHS acronym of the Jesuits inside, as you can see in this "Supreme Grand Encampment Knights Templar Certificate of the Brother Issac Rainey dated 19th November 1867". - Maximiliano
The High Knights Templar Seal in use from 1837 to 1869 was an equilateral triangle, each side measuring 2.2 inches.
The Seal was embossed on triangular black papers slightly larger than the die.
The device consists of outer and inner triangular lines, between which are the words, "Supreme Grand Encampt - of High Knights Templars - Metropolis of Ireland." Within the inner triangle are twelve small stars, arranged five to each side, and the letters "I.H.S." in the centre.
Supreme Grand Encampment Knights Templar Certificate
Brother Issac Rainey dated 19th November 1867 (note Seal)