The height (h) of the upper-case outline contour defines the nominal size of letters (capital). Angle of Lettering: The writing can be vertical (straight) or inclined (slanted) to the right at 75 degrees from horizontal. The use of italics indicates that this word is important for understanding the context. Italics are used to draw attention to words or phrases in a sentence or within a paragraph. The term "font" is used to describe the design of characters, as opposed to the design of typefaces which is a collection of fonts. For example, Arial is a typeface; however, Helvetica is also a font because it uses similar designs for many of its characters. Fonts come in two main varieties: fixed-width and proportional. With fixed-width fonts, each character has the same width under all circumstances. Narrower characters may fit on the screen or page more easily, but they cannot be adjusted later if needed. Proportional fonts give every character the ability to vary in width according to certain rules. These fonts are considered better for readability because they distribute text evenly across the page/screen. Fixed-width fonts are useful when you want to send information in an unchangeable format because they allow the computer to display any kind of text quickly and efficiently.