행간
행간, 줄높이, 리딩(leading)은 타이포그래피에서 인접한 줄 사이의 공간을 의미한다.

비교

예시 
이 텍스트 블록은 기본 행간을 지니고 있다:

<p style="line-height:100%; width:30em;">Typography (Greek: typos "form", graphein "to write") is the art and technique of setting written subject matter in type using a combination of typeface styles, point sizes, line lengths, line leading, character spacing, and word spacing to produce typeset artwork in physical or digital form.

동일 텍스트 블록은 50% 행간을 두어 읽기 더 쉽다:

<p style="line-height:150%; width:30em;">Typography (Greek: typos "form", graphein "to write") is the art and technique of setting written subject matter in type using a combination of typeface styles, point sizes, line lengths, line leading, character spacing, and word spacing to produce typeset artwork in physical or digital form.

100% 행간의 동일 텍스트 블록은 더 읽기 쉬울 수 있으나 수직 페이지 공간 이용을 덜 효율적으로 만든다:

<p style="line-height:200%; width:30em;">Typography (Greek: typos "form", graphein "to write") is the art and technique of setting written subject matter in type using a combination of typeface styles, point sizes, line lengths, line leading, character spacing, and word spacing to produce typeset artwork in physical or digital form.

각주 

타이포그래피