high-altitude, low-opening High Altitude Low Opening, type of parachute jump Hazy ring around bright lights seen by some patients with refractive error of optical defects To form, or surround with, a halo; to encircle with, or as with, a halo A faint outline of the printed image A light line around object edges in a image, produced by the USM (sharpening) technique A bright or dark ring around a drop of molten solder on a flat surface Acronym for High Altitude Low Opening Type of free fall military parachuting that entails exiting an airlift aircraft at high altitudes (up to 35,000 feet) and free falling to a low altitude (about 2,500 feet) before deploying the canopy The high altitude jump makes the airlift aircraft harder to shoot down and the low opening reduces the jumper's exposure to enemy observation and ground fire For its modern line, 21C has released a Special Forces HALO boxed figure and uniform set nimbus, circle of light surrounding the head of a saint or divine being; circle of light around an object caused by the refraction of light A colored circle around a nipple; an areola An ideal glory investing, or affecting one's perception of, an object nimbus, a luminous disc, often of gold, around or over the heads of saints, etc., in religious paintings the metaphorical aura of glory, veneration or sentiment which surround an idealized entity To encircle with a halo A circular band of coloured light, visible around the sun or moon etc., caused by reflection and refraction of light by ice crystals in the atmosphere Anything resembling this band, such as an effect caused by imperfect developing of photographs A circle of light; especially, the bright ring represented in painting as surrounding the heads of saints and other holy persons; a glory; a nimbus Connected with halos there are often white bands, crosses, or arches, resulting from the same atmospheric conditions A luminous circle, usually prismatically colored, round the sun or moon, and supposed to be caused by the refraction of light through crystals of ice in the atmosphere Rings of light or fuzz around lights often seen a night A ring of light In sign making, the effect achieved by reverse channel letters, which appear to be ringed by light because the light source is reflecting on the background from which the letters are pegged out (see galactic halo) halogens - A group of five nonmetallic elements, including fluorine, chlorine, bromine, iodine, and astatine heat - Energy that can move or transfer from one object to another because of a difference in temperature, resulting in a gain or loss of internal energy of particle motion helioseismology - The study of oscillations of the sun's photosphere that result from seismic events within the interior   A geological soil condition manifesting an effect known as "Metallurgical Phenomenon" A metallic halo is generated over time by the combination of acids and water in the soil leaching minute particles off a metal target into the surrounding soil The ring of light that seems to encircle the sun or moon when veiled by cirrus clouds To produce this phenomena, the ice crystals must be in a heterogeneous arrangement to refract the sunlight The most commonly observed is a halo that forms at a 22° radius, although another one at 46° radius may also be seen Also known as nimbus or aureole, the nimbus is a ring of light surrounding the head of a holy person A square halo means that the person was still alive when the picture was made (for instance Pope Paschal I in the apse mosaic at Santa Cecilia) a circle of light around the sun or moon a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke" A halo is a circle of light that is shown in pictures round the head of a holy figure such as a saint or angel A halo is a circle of light round a person or thing, or something that looks like a circle of light. The sun had a faint halo round it an indication of radiant light drawn around the head of a saint The spherical region of a spiral galaxy composed of diffuse gas an$containing few stars and star clusters (n ) The region around a point in a mesh, whose values are used when updating the value of the central point In a cellular automata, the halo comprises those neighbouring cells whose values are used by the automaton's update rule A metal ring used for patients with upper spinal cord injuries that surrounds or encircles the patient's head, allowing for proper alignment of the neck and spinal column (aka nimbus) A circle of radiant light around the heads of God, Christ, the Virgin Mary, or a saint A type of gloriole or glory It indicates divinity or holiness, though originally it was placed around the heads of kings and gods as a mark of distinction An overlap region around a decomposed data subdomain that mirrors a set of data values on a neighbouring processor Used to reduce the amount of interprocessor communication in parallel application "A solar flare event is called a 'Halo' event because the movies that are made show a full 'ring' of moving particles around the Sun's disk Because of this characteristic 'Halo' shape, we understand the particles to be moving in a direction towards the Earth " (Mike Kaiser) The points in the data domain outside the local domain a bright light, usually circular and positioned above or behind a saint's head The spherical region of a spiral galaxy containing a thin scattering of stars, star clusters, and small amounts of gas any of a variety of bright circles or arcs centered on the sun or moon, caused by the refraction or reflection of light by ice crystals suspended in the earth's atmosphere and exhibiting prismatic coloration ranging from red inside to blue outside a rim of color around the petals, usually contrasting to the main color, not found on plics Surrounded with a halo; invested with an ideal glory; glorified Adv nearly; almost; about; just about; practically rings around lights An outdoor pavement used by ancient Greeks for ceremonial dancing Rings or arcs that seem to encircle the sun or moon They are caused by the refraction of light through the ice crystals in cirrus clouds are rings around lights due to optical imperfections in or in front of the eye A complication of refractive surgery in which the patient sees additional rings around lights at night Halos are subjective experiences that often decrease with time A known complication of refractive surgery that causes images from light sources to blur with circles radiating out from the center Halos also occur naturally without refractive surgery