noun, used as a prefix
type 2; category 2; second class
Used as a prefix to classify things into a second type or category, often in technical, legal, or official contexts.
この書類は第二種郵便物として扱われます。
This document is handled as second-class mail.
第二種電気工事士の資格を取る。
I will get a Type 2 electrician license.