(1) (
Entertainment 
PC)  See 
HTPC.
(2) (
Evolved 
Packet 
Core)  See 
LTE architecture.
(3) (
Electronic 
Product 
Code)  A standard code for RFID tags administered by the GS1 and GS1 US international standards organizations.  The EPC ranges from 64 to 256 bits and contains, at minimum: product number, serial number, company ID and EPC version.
A Unique EPC for Everything
Unlike UPC barcodes, which do not have serial numbers, the EPC enables tracking of each physical item for everything we can conceivably ever make.  A 96-bit EPC can uniquely identify 16 million products in each of 268 million companies, and each product can have 68 billion serial numbers.  See 
Gen 2 and 
RFID.  Contrast with 
UPC.