This is a low-power CPU board form factor often used in passively cooled embedded systems. Mini-ITX has similarities with for example ATX and microATX form factors but is significantly smaller (170mm x 170mm). The form factor was announced by VIA Technologies in 2001.
Pico-ITX is a low-power single board computer form factor often used in passively cooled embedded systems. The dimensions of an embedded Pico-ITX motherboard are 100mm x 72mm which is half the area of Nano-ITX. Today embedded Pico-ITX single board computers can use the choice of either ARM or x86-based platforms. The compact size, low power consumption and high performance makes embedded Pico-ITX SBCs ideal for many space-constrained embedded design applications and markets. This includes industrial automation, medical, maritime, communication and transportation.