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➏; y;

IFF Active Y, both ways e.g. (from bottom to top) OR (from top to bottom), also see: Monbusho level knowledge enhancement, idea ♯ 171; Full Duplex Characteristic;

Active Y, also see: active; Active X, as oppose to Passive Y;

Gravity Dimension Computer (DEE, palm), doko WHERE Y is thumb alike EM and then X is fingers (4 Planets Prediction's sequence, Concurrency's 2.2., DNA's 2 ends of chromosome as gene) alike directional gravity in 2, 3 dimensional only WHICH means among 6 ; Also see: 6xComputer;

yagi _antenna, also see: Schematic Symbol;

IFF TV, also see: Sony; iroColourWaveForm ( yellow Diode) ... ; Also see: LED;