showing my ignorance here what does &#39 mean

[slowgo]

I am reading the stickey up top and see &#39 and I think &#33, sorry I am ignorant.
What does that mean? Is there a place to learn these acronyms I should know
so I dont seem so lame?

[slowgo]

Nevermind I posted that before I googled, sorry I'm a Dumba$$