Dąbrowski has an unidentified “American Masonic Symbols”, see below. There are quite a few symbols on it that are unfamiliar to me, such as this one. I don’t know in what rite or degree this combination is of significance.
A possible explanation can be found on this 28th degree Ancient and Accepted Scottish Rite tracing board. The triangles are arranged much differently, but they do come with an explanation.
The 4 triangles symbolize fraternal love, honest doubt of mysteries, neighbourliness, and faith in God and our future with Him.
Top: Dąbrowski P. 180. Year and designer unknown
Bottom: A. & A. R. The intermediate Degrees 19º – 29º A.C.F. Jackson (1982)