乃

乃

"乃" means "is", "of", or "thus," often indicating possession or a formal connection.

Here, '乃' is part of the place name '乃木坂 (Nogizaka)', signifying it is used as a character in proper nouns.

彼は乃木坂への旅行を楽しみにしている。

He is looking forward to the trip to Nogizaka.

In this context, '乃' is used in a classical-style sentence to mean 'of', conveying a connection between the words 'decision and action' and 'crystallization'.

勇気とは決定と行動乃結晶である。

Courage is the crystallization of decision and action.

Here, '乃' implies 'of' or 'expressing', linking '善意 (goodwill)' to '表れ (manifestation)' in a formal literary tone.

その行為は善意乃表れです。

That action is a manifestation of goodwill.