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. It could be a reference to the Holy Heart of Jesus and there is even a possibility for it being a reference to Faith, Hope and Charity, but I don’t know in what rite or degree this symbol is of significance.
A variation can be see here:
Top: Dąbrowski P. 180. Year and designer unknown
Bottom: collection (1844) of Georg Kloss (1787-1854)