(Internet slang) Alternative form of 俺 (ore)

the opening of a 館 (kan) on a given day - library (図書館), museum (博物館), hall (会館), etc. / the first opening of such a facility

The katakana syllable コ (ko). Its equivalent in hiragana is こ (ko). It is the tenth syllable in the gojūon order; its position is カ行オ段 (ka-gyō o-dan, “row ka, section o”).

conspiracy; collusion