Typing Alt text on a Mac

I don't know how this works on a PC. But I found how to type alternative characters on a Mac. I kept reading about Ømq, aka ZeroMQ. I did a View Source on my browser cuz I thought Ø was some sort of HTML entity like & . Now I know you just type option-shift-o. This all started cuz a friend typed a tempature as 72º and I thought it was an o in superscript tags (it is option-0). Now I plan on using it all the time cuz the Web is UTF8 not the ASCII I am used to. „´‰ˇÁ¨ˆ. Oooh just discovered  neat.

P.S.
Oh here is Table of many the Characters Mac & PC

P.S. P.S.
And more with links to PDFs listing this stuff