Uni Flash

In manga, unifura ウニフラ, or "uni flash," uni furasshu ウニフラッシュ, is flash of light with a black outline that looks like a "sea urchin," uni 雲丹.

The uni flash is drawn like the beta flash, using focus lines, except that instead of a black background they're placed on just any background.

Typically, they're used as speech balloons, or rather, as thought balloons.

Manga: Zatch Bell!, Konjiki no Gash!! 金色のガッシュ!! (Chapter 5, 道具か人間か！？)

Examples

For reference, some examples:

Manga: Prison School, 監獄学園 (Chapter 168)

Context: a girl is conflicted.
n? nanda.. kono kimochi wa..
ん？なんだ･･この気持ちは･･
Hm? What is it.. this feeling..
- In my chest..??!!

Manga: Gabriel DropOut, ガヴリールドロップアウト (Chapter 24)

Context: a character is walking around when all of sudden this girl shows up and...
chotto okane kashite kurenai?
ちょっとお金貸してくれない？
Won't [you] lend [me] a little money?
nandesuka kono hito!?
なんですかこの人！？
What's [up with] this [girl]!?
- She just asked money from a complete stranger!

Manga: Zatch Bell!, Konjiki no Gash!! 金色のガッシュ!! (Chapter 5, 道具か人間か！？)

Context: the antagonist made a mistake. Takamine Kiyomaro 高嶺清麿, grinning, comments on it.
he...
へ･･･
Heh...
zamaa miro...
ざまあみろ…
- [It servers you right...]
- Expression used toward someone when they make a mistake.
kono kuso yarou...
このクソ野郎･･･
[You piece of shit]...