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WHAT IS "ret_code_t" ??????

HI... I'm in the middle of understanding code line by line...I've taken classes of C/C++ for an year, but BLE programming by myself is so difficult ㅠㅠ 
I have a very simple question that I can't find out!!!!

WHAT IS " ret_code_t"????
I can find it in many of the codes.. but can't find out what that actaully is. 
I'm worried if it's a really easy question like "what is int" but I had no choice...
Thanks!(Sobs)