What do you mean BTH?
in British English. abbreviation for (in the US and Canada) Bachelor of Theology.
What is acronym short for?
An acronym (pronounced AK-ruh-nihm, from Greek acro- in the sense of extreme or tip and onyma or name) is an abbreviation of several words in such a way that the abbreviation itself forms a pronounceable word. The word may already exist or it can be a new word.