Yes, I knew this, but the question was different and bad stated.
I want to refer to pins that are not in the D series, like the GPIO6, GPIO7 and GPI11 which, from @horace answer I can simply define as 6,7, 11, but... I Just discovered that I can not use these pins; actually, as soon as I configure them, i.e.
#define IO7 7
pinMode(IO7, OUTPUT);
I get a WDT timeout crash.
At the end of 16 digital IO pins I can only safely use 7 of them:
2 for I2C (D1, D2), 4 for my I/O (D5..D8), 1 (D4) for TXD1; I miss one pin for output.
Can I use IO16 (D0) for this? Or any other pin?