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 Object Oriented A method in drawing and other computerprograms that produces graphics from arc and line segments that are mathematically defined by points located on thehorizontal and vertical axes on the screen.

Oblique A slanted roman character. Unlike many italics,oblique characters do not have cursive design properties.




Offset Lithography A printing method using flat photo-mechanical plates, in which the inked image is transferred oroffset from the printing plate onto a rubber blanket, then on to the paper.


Oldstyle Typeface styles derived from fifteenth- to eighteenth-century designs, and characterized by moderate thick-and-thin contrasts, bracketed serifs, and a handwriting influence.

Old Style Figures Numerals that exhibit a variation in size, including characters aligning with the lowercase x-height, and others with ascenders or descenders.

Operating System A computer program that controls a computer’s operation, directing information to and from different components.

Optical Alignment The precise visual alignment and spacing of typographic elements. In interletter spacing, the adjustment of individual characters to achieve consistent spacing.

Orphan A single word on a line, left over at the end of a paragraph, sometimes appearing at the top of a column of text. See Widow.

Outline A font designed, not as a bitmap, but as outlines of the letter shapes that can be scaled to any size. Laser printers and imagesetters use outline fonts. See Bitmapped font and Screen font.

Outline Type Letterforms described by a contour line that encloses the entire character on all sides. The interior usually remains open.