TTFN
（重定向自Ta ta for now）
TTFN is an initialism for a colloquial valediction, 'ta ta for now', based on 'ta ta', an informal 'goodbye', approximately equivalent to 'bye bye' but in an easier meaning it means 'goodbye for now'. The expression came to prominence, in the UK, during the Second World War. Used by the military, it was frequently heard by the British public.