Are there any swearing words in the letters, such as BT?

Netizens convert English or Chinese into abbreviations. At first, this language was just a way for netizens to improve the efficiency of online chat. Over time, a relatively fixed network language has been formed. It follows the principle of convenience, and its purpose is to express complex or inconvenient things with one or several simple letters. There are two main forms of abbreviations: (1) conventional abbreviations. English and Chinese Pinyin also have abbreviations. For example, BTW is an English abbreviation by the way; "Please email me when you are free", which is the abbreviation of email. "bb" is the English abbreviation of bye-bye; "VG" is the English abbreviation of Very Good; "PM" is the abbreviation of "forgive me". Another example is the abbreviation of Chinese phonetic initials. If you are called GG, DD, JJ, MM or PLMM on the Internet, they are all very intimate terms, referring to elder brother, younger brother, elder sister, younger sister or beautiful younger sister, adding a cordial feeling to the originally cold virtual network world. Of course, there are also some pinyin abbreviations that are not easy to export, such as TMD, BT and PMP. (2) Irregular abbreviations. For example, 3KU and B4 are Chinese-English combined abbreviations of thank you and before, respectively; "HRU" means hello (how are you? English abbreviation for); "Cu" is the abbreviation of see you, and so on.

"PF" and "BT"