Type with a high x-height has a relatively large distance between the baseline and the tops of the main body of lowercase letters, typically having short ascenders and descenders.
Typotheque turns 20 this month, and to celebrate we have prepared a number of announcements as well as a digital revival of a font that we first published in 1999.
The x-height refers to the distance between the baseline and the top of the lower case line in a typeface. Typically, this is the height of the letter x in the font (the source of the term).