|E region or E layer|
|See also ionosphere Heaviside layer, Also called: Kennelly-Heaviside layer a region of the ionosphere, extending from a height of 90 to about 150 kilometres. It reflects radio waves of medium wavelength|
|E layer or E layer|
|a chattering or flighty, light-headed person.|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
The region of the ionosphere that lies approximately 90 to 150 km (56 to 93 mi) above the Earth's surface. This region may affect long-distance communications because it influences radio waves in the 1-3 megahertz range. Also called E layer, Heaviside layer. Compare D region, F region.