Abbreviations and Emoticons in Email
Some members of the workforce favor a kind of email shorthand common also in instant messages, online chat, and cell phone text messages. Resist the temptation to incorporate such shorthand into work-related email messages.
For example, lol stands for “laugh out loud.” If you must use it (the act of laughing typically involves sound, so the utility of mentioning that it is out loud is unclear), save it for personal communications. Other shorthand examples you should avoid in professional email messages include:
When r u going to arrive?
c u there.
In addition, emoticons such as :-) or :-( are best confined to personal email.