Onomatopoeia
4The Structure · 58Also written: sound effects, sfx
Drawn sound effects integrated into manga artwork, covering not only noises but also states like silence and staring.
4A 4 by its term: builder & organizer, and therefore the structure.
What it means
Japanese has an unusually large inventory of sound-symbolic words, and manga uses them heavily. These are typically hand-drawn into the artwork rather than set as type, making them part of the image.
Not just sounds
The distinctive feature for English readers is that many of these words describe things that make no noise at all. There are conventional effects for silence, for a steady stare, for glittering, for nervous tension, and for the sensation of a room going still. English has no equivalent category.
How translations handle it
Approaches vary. Some publishers redraw effects in English, which is expensive and can damage the art. Many leave the original lettering intact and place a small gloss beside it. Others do nothing at all.
New readers commonly skip these, a habit carried over from prose. It costs a surprising amount of atmosphere, since the effects are often doing the work a soundtrack would do elsewhere.
The term by its numbers
The arithmetic is unremarkable and worth doing anyway: 58 across 1 word, reducing to 4.
What the 4 brings is foundation. The reference files it as a structure. Whatever else this entry is doing, it is doing it with the 4's insistence that what lasts must be built patiently.
Heart's Desire 4, Personality 9: the presentation folds back into the want: reckoning in service of foundation.
The 4 asks you to look for the constraint the subject was working inside. The 4 confuses the frame for the work. Structures outlive their usefulness, and several entries here describe conventions kept long past their reason. The other entries that reduce to 4 are collected on The Structure.