acentric factor and configuration factor

factor VIII [=antihemophilia factor

factor X [=Stuart factor

factor XII [=Hageman factor

frequency factor preexponential factor

Nuclear factor (erythroid-2 related) factor 2

Nuclear factor erythroid 2-related factor 2

preexponential factor frequency factor

tumor necrosis factor receptor associated factor 6

Tumor necrosis factor receptor-associated factor 4

Tumour necrosis factor receptor-associated factor

Tumour necrosis factor receptor-associated factor 6

P-P factor pellagre-preventative factor

nuclear factor erythroid-2 related factor 2 Nrf2

nuclear factor erythroid 2-related factor 2 Nrf 2

nuclear factor E2-related factor 2

90 tiling off-axis parabolic mirrors

Seamless Tiling

Tiling

vertical tiling