symbols symbols symbols

I am in my second stats class and have found that this professor uses different symbols than my previous professor. Example - for the alternative hypothesis this summer it was Ha, my new prof. uses H1 (the 1 is small). Is there any book out there that says "hey these are all the ways _________ can be written, it depends on who is talking"

Thanks...I just spent a grueling summer learning this new "language" and now have to learn another it seems.:confused: