App is the abbreviation of application, and is mainly used to identify an application on a smartphone. It actually means application and exists since there are computers, but with the advent of Apple's ITunes store it's an abbreviation that the general public has embraced. An app Read More
EOM (or better yet (EOM)/<eom>) is used to indicate that the message is not larger.</eom> It is used on Twitter and in MSN and SMS messages, but it can also be used in the e-mail. If you put EOM in the subject of an e-mail message, the recipient knows that the rest of the message does not need to be read. So it is useful for small messages.