They're not confusing, I actually really like using them since I read about them here because it makes your code even more readable - I can scan a page and quickly see where all of one specific variable is, as opposed to regular english variables that can blend in a lot easier.

[Tip] Variable Prefixes

Explains a lot of the ones used by people in this forum, though I think we all have our own minor variations (for example I went through phases where I used i, then int, then iz, and now I'm back to i... my style evolves as my knowledge does, sometimes for good reasons, other times just because I need to try things before I find what I like).
-m