What does it mean if ENA is negative?

Could you please clarify what the significance is when ENA is negative? What does this negative ENA value indicate in the context of the subject matter we're discussing? How does it affect the overall picture or analysis? Is it something that should be cause for concern, or is it merely a neutral finding? Could you elaborate on the potential implications of a negative ENA and how it might influence decision-making or further investigation? Thank you for your explanation.