What is the background of ātmatattvam?
Btw, the yantra is a common one. Among other uses, it appears to be the one associated with Lakshmi. Others who are more informed may recognize other meanings associated with it.
The basic form, that of the intersection an upward-pointing triangle (male principle) and downward-pointing triangle (female principle), is so general that it could also be associated with several other tantrik traditions.
Best,
Dean