Nikkei 225 option
Financial term for options contracts based on the Nikkei 225 stock index.
Nikkei 225 options are traded on the Osaka Exchange.
Refers to the Nikkei 225 stock index itself, not the derivative option.
Standard spelling using half-width numerals.
Full-width kanji numeral variant; less common but still seen.
Compound of 日経 (Nikkei, abbreviation of 日本経済新聞) + 225 (the index number) + オプション (option).