The tag insert wiki states:
A data entry mode. An example would be new data typed on the keyboard to be inserted at the current cursor location on screen.
For me it sounds like a meta tag because it is too vague to be used as only tag in the question. If it can apply to inserting row into SQL table, inserting cell into Excel sheet or inserting a few characters into HTML TextArea, how could it function without other tags?
According to the cited article of Jeff Atwood, such meta tags should be burninated.