EPIA

Computer form factors
Listed by PCB size (mm)
WTX	356×425
AT	350×305
BTX	325×266
ATX	305×244
LPX	330×229
NLX	254×228
DTX	244×203
FlexATX	229×191
Mini-DTX	203×170
microATX	171×171
Mini-ITX	170×170
EPIC (Express)	165×115
Nano-ITX	120×120
COM Express basic	125×95
EBX	203×146
ETX / XTX	114×95
Pico-ITX	100×72
PC/104(-Plus)	96×90
COM Express compact	95×95
COM Express mini	55×84
mobile-ITX	60×60

VIA EPIA (VIA Embedded Platform Innovative Architecture) is a series of mini-ITX, em-ITX, nano-ITX, pico-ITX and pico-ITXe motherboards with integrated VIA processors. They are small in size and consume less power than computers of comparable capabilities.

There are several types of VIA EPIA motherboard: Nano-ITX versions, based on the VIA CoreFusion processor series, and Mini-ITX form factor featuring VIA CPUs and northbridges in separate packaging. They were originally built for industrial applications but came to have a wide range of applications in the consumer market, such as carputers, firewalls, HTPCs, and Small File servers..

The VIA EPIA motherboards have the following designators:

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Wikipedia