Many of us may understand what these acronyms mean, but this is a public forum and we cannot assume that everyone else will. Moreover, we have an international readership, so we must be aware of colloquial phrases that can be confusing to our non-English speaking readers. If we want an insular site, we can speak in code and outsiders will not feel welcome. However, if we wish to be open to all, we need to be warm, friendly and engaging. The latter is enhanced by writing in a way that all can understand. Thanks!