also: ナルがた
null type
In programming, a type that represents the absence of a value; often used in languages with nullable types or option types.
In this language, a variable of null type can explicitly indicate that it holds no value.
Alternate spelling using ナル, also seen in technical discussions.
From English 'null' + Japanese 型 (type). The alternate spelling ナル型 reflects a variant pronunciation of 'null'.