Pronouncing years
My grandparents spoke of the first decade of the twentieth century from their own experience and they never said "nineteen-oh-one". It was "nineteen one".
"Oh" evolved as a way to pronounce telephone numbers, being more distinctive than "nought" on a crackly line. Its usage in pronouncing a year arose afterwards, incorrect because unnecessary: "nineteen-one" is unambiguous.
Unfortunately we cannot say the same of 2001. "The year twenty one" sounds like "the year twentyone". I am happy to say "two thousand and one" for I am not in a hurry.
I prefer to say "the world-wide web" than "double-you double-you double-you". there are far fewer syllables.
Before decimal currency came in to the UK in 1971, the old pennies were spelt "d" - abbreviation for "denarii" and pronounced penny or pence. For some incomprehensible reason, the public after decimalization consented to call the new penny a "pee": one pee, two pee, half-pee (now obsolete). Why?