Romanesque architecture is a historic style popular for a range of time in medieval Europe. The style is similar to Roman and Byzantine architecture and features characteristics of both, including round arches, groin vaults, and plenty of art and sculpture.

A rib vault is a type of vault made up of crossed diagonal arches that look like ribs. Rib vaults are extremely popular structural ideas found throughout many styles.

Renaissance architecture was the design style of a period of European revival. Much of the style was inspired by Classical architecture. The characteristics of Renaissance architecture focused on proportions in the search for perfect beauty. They studied the human body in comparison to buildings and attempted to create a perfect work through integration of architecture, art, and sculpture.

Rectilinear designs are made up of mostly straight lines and right angles. It is often understood as the opposite of curvilinear which is also defined on this list.

Red, Green, and Blue, a color model used for electronic displays like computers and televisions, contrasting with CMYK.

A measure of image quality based on dots per inch for printed materials and pixels per inch for digital works. Higher resolution yields crisper images.

An image composed of a grid of pixels, each with specific values for color, hue, saturation, and transparency. Unlike vector images, raster graphics do not scale smoothly and may pixelate when enlarged.