The e32 prefix used in the source is for EPOC32, Symbian’s original name, so you can count that as a reference. But books about Symbian say it was a complete re

The e32 prefix used in the source is for EPOC32, Symbian’s original name, so you can count that as a reference. But books about Symbian say it was a complete rewrite of the original 16-bit, C-language EPOC, there probably isn’t any code that comes from there verbatim. (The Psion was the brand of computers, the EPOC was the OS.)