Tools|autocorrect options|autocorrect tab
remove the hsi from that list at the bottom.

Or hit ctrl-z as soon as excel jumps in with the autocorrection.

Mike wrote:

Does anyone know why you cannot enter the letters HSI into a cell? it will
change them to HIS. However, a line of code will enter HIS:
ActiveCell.Value = "HIS"

Mike F

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Dave Peterson