Quote Originally Posted by Lachlan09 View Post
That's right, the circle represented "O", 15th letter of the alphabet and the triangular device in the middle was a “scotch” block, a form of wedge used in industrial applications.

But, Cajun, I dinnae think it was germane, I’m pretty sure it was Scottish.
But the formation sign was a "scotch" block, not a "Scottish" block.

T.