This could be a type of smiley face that did not show up. You an also ask the sender what that means for clarification.
lkr
Domestic text messages are messages that are sent and/or received within the boundaries of the 50 United States.
In text messages, the abbreviation "nk" typically means "no kidding."
Killjoy
it mean i don't know
Laughing but serious
dont worry about it
Lic mean Like i care
In text messaging WUBUT is an acronym for "What you been up to?" It is internet slang or lingo that is used in text messages and instant messages.
it means ok
Don't Hit The Cell
"nc" in text messages stands for "no comment." It is often used when someone does not want to provide a response or opinion on a particular topic.