The phrase 'เป็นอันจบ (pen an jòp)' is used in Thai to indicate that something has reached its completion or the end. This can refer to an event, a story, a meeting, etc. It is equivalent to English expressions such as 'That's it', 'it's over', or 'to conclude', and is often used to signify the closure or finality of something. It is typically placed at the end of sentences.