How do you spell the sound of happiness?

There's no single spelling for the sound of happiness! It's a feeling, and feelings are subjective, so everyone experiences happiness differently.

You could try to convey the sound through:

* Onomatopoeia: Words that imitate sounds, like "whee!", "yay!", or "giggle."

* Descriptive words: Words that paint a picture of happiness, like "joyful," "lighthearted," or "contented."

* Music: Music can evoke strong emotions, including happiness.

Ultimately, how you spell the sound of happiness depends on your own personal interpretation.