What I want are the symbols used in the textbook Theory of group representations and applications of Asom O. Barut and Ryszard Raczka (2n ed.) for semidirect sum and semidirect product. I upload a photo.
I have been looking for in Unicode symbols and i don't find anything, so probably it is going to be diffcult.
Remark. This question have been marked as possible duplicate question. I don't agree with that. I've tried to use Detexify to find my symbol, but it didn't recognize it. Probably I should study The Comprehensive LaTeX Symbol List better, but that is another question. Any of the answers provided in How to look up a symbol or identify a math symbol or character? solves my problem.