53
I've paraphrased here the relevant portion of the manpage for people who have trouble finding it:
< means that a file is being transferred to the remote host (sent).> means that a file is being transferred to the local host (received).c means that a local change/creation is occurring for the item (such as the creation of a directory or the changing of a symlink, etc.).h means that the item is a hard link to another item (requires --hard-links).. means that the item is not being updated (though it might have attributes that are being modified).* means that the rest of the itemized-output area contains a message (e.g. "deleting").f for filed for directoryL for symbolic linkD for deviceS for special file (e.g. socket or fifo)c means either that a regular file has a different checksum or that a symlink, device, or special file has a changed value.s means the size of a regular file is different and will be updated by the file transfer.t or T:
t means the modification time is different and is being updated to the sender's valueT means that the modification time will be set to the transfer timep means the permissions are different and are being updated to the sender's valueo means the owner is different and is being updated to the sender's valueg means the group is diffI believe that output comes from the '-i' flag, search the man page for 'itemize' a few times (or search for 'cryptic output') and it shows what all the flags mean: