Head to our Just Curious section to see what else we can answer. This article originally appeared on USA TODAY: What does 'PS' mean? The abbreviation's definition and how to use it.

From "x" and "o" meaning "hugs and kisses," respectively, to the intricacies of deciding what salutation to use in a letter, it may take some time before you become an expert. But we're here to help.

Letter writing has been an art form for many centuries. From "x" and "o" meaning "hugs and kisses," respectively, to the intricacies of deciding what salutation to use in a letter, it may take some ...