What does o1, h1, h2 and o3 mean?

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...............: STANDARD CODES ::...............
:                                               :\
: [a] This is simply an alternate version of a  :\
:     ROM. Many games have been re-released to  :\
:     fix bugs or even to eliminate Game Genie  :\
:     codes (Yes, Nintendo hates that device).  :\
:             -------------------               :\
: [b] A bad dump often occurs with an older     :\
:     game or a faulty dumper (bad connection). :\
:     Another common source of [b] ROMs is a    :\
:     corrupted upload to a release FTP.        :\
:             -------------------               :\
: [f] A fixed game has been altered in some way :\
:     so that it will run better on a copier    :\
:     or emulator.                              :\
:             -------------------               :\
: [h] Something in this ROM is not quite as it  :\
:     should be. Often a hacked ROM simply has  :\
:     a changed header or has been enabled to   :\
:     run in different regions. Other times it  :\
:     could be a release group intro, or just   :\
:     some kind of cheating or funny hack.      :\
:             -------------------               :\
: [o] An overdumped ROM image has more data     :\
:     than is actually in the cart. The extra   :\
:     information means nothing and is removed  :\
:     from the true image.                      :\
:             -------------------               :\
: [t] A trainer is special code which executes  :\
:     before the game is begun. It allows you   :\
:     to access cheats from a menu.             :\
:             -------------------               :\
: [!] Verified good dump. Thank God for these!  :\
:...............................................:\
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