A quotation mark '' , apostrophe ' , or semicolon ; can be added to the emoticon to imply apprehension or embarrassment , in the same way that a sweat drop is used in anime . o-o , e_e , e.e and\/or owo A quotation mark '' , apostrophe ' , or semicolon ; can be added to the emoticon to imply apprehension or embarrassment , in the same way that a sweat drop is used in anime .