What do the "im_start" and "im_end" tokens mean?

Previously, I thought im means image, but then I found they are part of the ChatGPT ChatML: openai-python/chatml.md at main · openai/openai-python · GitHub . So what do the “im_start” and “im_end” tokens mean? To be specific, what does “im” stand for?

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From what I have learned "im_start" is a token that represents the beginning of an input message. So im should stand for input message