Variations in stress: This characteristic involves the distribution of visual weight between different designs. Earlier designs were made with diagonal stress as a way of mimicking handwriting. Stresses evolved to become perfectly vertical and later, in some fonts, the stress has been completely removed from the design.
Variations in thicks and thins: This characteristic features the contrast between the thick and thin strokes of letters.
Variations in serifs: This characteristic involves a serif’s weight and the way it is bracketed. The way it is bracketed is the way in which the serif corresponds with the vertical stroke of the letter.