an abbreviation consisting of the first letters of each word in the name of something, pronounced as separate letters

HTML is an initialism of HyperText Markup Language. HTML是“HyperText Markup Language（超文本标记语言）”的首字母缩略词。

Cable News Network, usually referred to by its initialism CNN, is a major English language television network. 有线电视新闻网（Cable News Network），通常以其首字母缩写CNN来称呼，是一家大型英语电视网。