亀甲 きっこう括弧 かっこではありませんでした
kikkōkakkodewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 亀甲括弧

1. Was not a tortoise-shell bracket.; Was not a curly brace.

Past/Perfective
Negative
Polite
Formal Register