A | B | C | D | E | F | G | H | I | J K L | M | N | O | P | Q |  

 R | S | T | U | V | W | X Y Z #

 

 XFCB             extra-fast complementary bipolar

XPD                cross polarization discrimination

XPIC               cross polar interference canceller

XPOL             cross-polarization level

YAG               yttrium aluminum garnet

YBCO             yttrium barium copper oxide

YIG                 yttrium iron garnet

YTO                YIG-tuned oscillator

2DEG              two-dimensional electron gas

3G                   third generation

3GPP              Third-generation Partnership Project

4G                   forth generation

5G                   fifth generation