also: れいせん
The Zero fighter was a fighter plane used in World War II.
Standard kanji spelling; the reading ゼロせん is the most common.
Alternate reading れいせん is less common but still encountered.
Common kana-kanji mixed spelling, using katakana for ゼロ.
An abbreviation of 零式艦上戦闘機, “Type Zero carrier-based fighter.” 零式 refers to its formal adoption in imperial year 2600 (1940), whose final two digits were zero.