Microtypography
Microtypography is concerned with individual components of typography like letters, letterspacing, words, wordspacing, lines and linespacing. Microtypography affects reading and legibility. The term was coined by Jost Hochuli in 1987.
‘While macrotypography – the typographic layout – is concerned with the format of the printed matter, with the size and position of the columns of type and illustrations, with the organization of the hierarchy of headings, subheadings and captions, detail typography is concerned with the individual components – letters, letterspacing, words, wordspacing, lines and linespacing, columns of text. These are the components that graphic or typographic designers like to neglect, as they fall outside the area that is normally regarded as “creative”…’
Microtypography on the web
See Space characters for microtypography
References
Detail in Typography by Jost Hochuli
https://www.designersreviewofbooks.com/2010/09/jost-hochuli-detail-in-typography/