TTFN
abbreviation(informal, British English)(used in emails and text messages to say goodbye to somebody) ta-ta for now再见（全写为 ta-ta for now，用于电邮和短信） Anyway, TTFN, and hopefully I'll have plenty of time to write when I get back. 先这样吧，再见，希望我回来时有大把时间写信。