The Korean language uses special measure or counting words for specific objects and events. These suffixes are called subullyusa (수분류사; 數分類詞) in Korean. They are similar to the ones employed in the Chinese and the Japanese languages.
In English it is "two sheets of paper", not "two papers". Analogously, in Korean jang (장/張) is used to count sheets or anything that is a paper-like material, for example "ten bus tickets" is beoseu pyo yeol jang (버스 표 열 장 / 버스 票 열 張), literally, "bus ticket ten 'sheets'". In fact, the meanings of counter words are frequently extended in metaphorical or other image-based ways. For instance, in addition to counting simply sheets of paper, jang in Korean can be used to refer to any number of thin, paper-like objects. Leaves (namunnip 나뭇잎) are counted using this count word. In this way...