K7

K7 may refer to several unrelated topics across mathematics, computing, and science. In graph theory, K7 denotes the complete graph on seven vertices: a simple graph in which every pair of distinct vertices is connected by an edge. It has seven vertices and twenty-one edges, and it is non-planar; it serves as a basic example in studies of planarity and graph coloring.

In computing, K7 has been used as an internal codename by AMD for its seventh-generation x86 microarchitecture that underpinned the Athlon family in the late 1990s and early 2000s, contributing to the development of later AMD processors. The term appears in historical and technical literature as a code name rather than a product name. Separately, K7 Computing is a cybersecurity company headquartered in India that offers antivirus and security software, including K7 Total Security and K7 Security Suite.

In astronomy, K7 may appear as a designation in stellar classification for a subclass of K-type stars, indicating a relatively cool, orange-hued star between K6 and K8 in the spectral sequence. This notation appears in some catalogs and classifications of stellar spectra.

Other uses of K7 exist in branding and model designations, where the combination of the letters and number is chosen for differentiation or marketing purposes. Such uses are context-dependent and not standardized.