Vertical orientation of weight axes. (The vertical parts of letters are thick.)
Strong contrast between thick and thin lines. (Horizontal parts of letters are thin in comparison to the vertical parts.)
An unornamented, "modern" appearance.
Examples include the slightly condensed, unbracketed serif typefaces Bodoni, Computer Modern, Didot, and Walbaum. The category is also known as modern or modern face (in contrast to old style serif, which dates to the late medieval era). This style emerged in the late 18th century; Didot was its first representative.