ooooh

Elongated form of ooh.

“I don't know, but they say it's not so bright now as it was in other places. Still, even if you'd had your bandages off today, I don't expect they'd have let you watch it. You'll have to take things gently at first, and some of the flashes are very bright. They -- Ooooh!” “Why ‘ooooh’?” I inquired. “That was such a brilliant one then - it made the whole room look green.”

Elongated form of oh.