> in this listing of man pages from Third Edition Unix (1973) collected by Dennis Ritchie himself, it does contain the line:
> > atoi(III): convert ASCII to integer
> In fact, even the first edition Unix (ca 1971) man pages list atoi as meaning Ascii to Integer.
It's also in the FreeBSD [1], NetBSD [2] and OpenBSD [3] atoi man pages.
[1]: https://man.freebsd.org/cgi/man.cgi?query=atoi&sektion=3
