笺：就是写信或题辞用的纸。如：信笺、便笺。缄：就是把信装进袋封起来。如信封上寄信人的地址后面常写“缄”启：就是开开。如信封上惧怕人的姓名后面常写个“启”，就是让收信人拆开看。函：就是信袋，也是信的代称。如“来函收以”，就是来信收到了。“笺缄启函”的含义@赵 笺: is the letter or inscription paper. Such as: letterhead, notes. TALK: It is to seal the letter into the bag. Such as the address on the envelope after the sender often write “open” Kai: that is, open. Such as the envelope on the name of fear of people often write a “Kai”, is to let the recipient apart look. Letter: is the letter bag, but also on behalf of the letter. Such as “letter received”, is the letter received. “笺 笺 启 函” meaning @ Zhao