From the hiragana characters used to draw it.
へのへのもへじ (romaji henohenomoheji)
- a face drawn using the hiragana characters he (へ), no (の), he (へ), no (の), mo (も), he (へ), and ji (じ)
The first two he are the eyebrows, the two no are the eyes, the mo is a nose, and the last he is the mouth. The outline of the face is made by the character shi, its two short strokes (dakuten) forming the ear.