** Polar Atlas, historic Swedish diesel maker, later part of Atlas Copco

** Polar coordinate system ( 2D )

** Norway opens a natural gas field in the Polar Sea.

** Polar circle, either of two circles of latitude marking the extreme southerly points ( northern hemisphere ) or northerly points ( southern hemisphere ) at which the sun may remain above or below the horizon for 24 continuous hours at some point during the year

** Polar region, the region within the polar circles, referred to as the Arctic and Antarctic

** Polar climate, the climate of the polar regions, characterized by a lack of warm summers

** Polar front, the boundary region between the polar cell and the Ferrel cell in each hemisphere

** the French Polar Institute ( in Plouzané next to Brest )

** The Polar Express-Randy Thom, Tom Johnson, Dennis S. Sands and William B. Kaplan

** The Polar Express – Dennis Leonard and Randy Thom

** Polar moment of inertia, a property of an object related to its resistance to torsion

** The Alaska Film Archives, housed in the Alaska and Polar Regions section of the Rasmuson Library, hold the largest collection of film-related material about Alaska.

** Alfred Wegener Institute for Polar and Marine Research

** Canadian Polar Commission

** ABBA ( compilation with tracks licensed from Polar )

** Polar Shift ( 1991 )

** UAM Polar sail training ship

** Polar Coordinates

** Polyarnaya Zvezda ( Polar Star )

** Mars Polar Lander ( formerly the Mars Surveyor ' 98 Lander )

** Double-sideband modulation ( DSB )

** Single-sideband modulation ( SSB, or SSB-AM )

** Vestigial sideband modulation ( VSB, or VSB-AM )

** Quadrature amplitude modulation ( QAM )

** Frequency modulation ( FM ) ( here the frequency of the carrier signal is varied in accordance to the instantaneous amplitude of the modulating signal )

** Phase modulation ( PM ) ( here the phase shift of the carrier signal is varied in accordance to the instantaneous amplitude of the modulating signal )

** M-ary vestigial sideband modulation, for example 8VSB

** discrete multitone ( DMT )-including adaptive modulation and bit-loading.

** Self-phase modulation ( SPM ), an effect due to the Optical Kerr effect ( and possibly higher order nonlinearities ) caused by the temporal variation in the intensity creating a temporal variation in the refractive index

** Optical solitons, An equilibrium solution for either an optical pulse ( temporal soliton ) or Spatial mode ( spatial soliton ) that does not change during propagation due to a balance between diffraction and the Kerr effect ( e. g. Self-phase modulation for temporal and Self-focusing for spatial solitons ).

** Delta-sigma modulation

** The " nominal frequency " or the center frequency of an analog frequency modulation, phase modulation, or double-sideband suppressed-carrier transmission ( DSB-SC ) ( AM-suppressed carrier ), radio wave

** In very technical language: The nominal frequency or center frequency of various kinds of radio signals with digital modulation -- provided that the message bit stream is a random uncorrelated sequence of equally probable ones and zeroes (" marks " and " spaces ")

** In an AM ( amplitude modulation ) transmitter the amplitude ( strength ) of the carrier wave is varied in proportion to the audio signal.

** In an FM ( frequency modulation ) transmitter the frequency of the carrier is varied by the audio signal.

** Frequency modulation synthesis, a form of audio synthesis where the timbre of a simple waveform is changed by frequency modulating it with a modulating frequency that is also in the audio range

** Frequency modulation synthesis, a sound-generation technique popularized by early digital music synthesizers

** decal, modulation blending, tiling ( 16K / 128K texture buffer built-in )

** Pulse-code modulation ( PCM )

** Oscillator Synchronization, Ring modulation

** Inter-carrier interference ( ICI ), caused by doppler shift in OFDM modulation