The J is actually supposed to be a smiley face. If you have Wingdings installed on your computer, the following character will appear as a smiley face. Otherwise, it will be the letter "J": J This is because the letter J represents a smiley face icon in the Wingdings font. Microsoft Outlook, a popular e-mail client, automatically converts the :) and 😊 text emoticons into smiley face icons using the Wingdings font. Therefore, when Microsoft Outlook users type smiley faces in an e-mail message, they are sent as visual smiley face icons. https://english.stackexchange.com/questions/46829/what-does-a-single-letter-j-mean-in-emailing