What information is displayed in default prompt?

[gzagatti]

My default prompt reads like:

[utM] In [1]:

Unfortunately I could not find in the documentation what the information displayed in the first set of square brackets mean [utM]. Can someone clarify what it means? Is it some hash for the kernel I am connected to?

[gzagatti]

Ok, I've figure out that [utM] comes when using the option c.ZMQTerminalInteractiveShell.editing_mode = 'vi'.

However, as opposed to the IPython in Jupyter Console the following option is not satisfied (or equivalently setting it as ZMQTerminalInteractiveShell):

c.TerminalInteractiveShell.prompt_includes_vi_mode = False

Therefore, [utM] seems to stand for nothing at the moment. In Python, the prompt changes from [nav] to [ins].