How to translate a mathematical term?

Question

Mathematics

Good afternoon!
I have a request for help to those who are well versed in mathematics.
Now I am translating the text from Czech. The following phrase was encountered there: "Four comprehensive aspects: one makes up a point, two - a segment, three - a plane, four - a complex group." I am a little confused by the term "complex group", which I cannot google either in the original language, or even more so in Russian (or rather, there are groups in mathematics, of course, but, in my opinion, they are poorly correlated with geometry and with the meaning of the phrase). What do you think, what is it about? Really about groups? About 3D objects? About the intersection of planes?

Answer 1

I suspect we are talking about the Complex Projective Plane