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Toys and games
1) Devices that are used exclusively for recreation and play. Toys are most often used with children and pets and as a medium of education and development. Toys are not always obvious in their nature. A simple bottle can be considered a toy if an individual uses it for recreational use. 2) Games are structural activities used for physical or psychological education. In most cases, games are recreation. However, games can also be considered work. For example, a professional soccer game is a career to the participants.
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argon (Ar, 1S0 in ground state)
Astronomy; General astronomy
colourless, odourless gas comprising 1% of the atmosphere
argument of the perihelion (ω, longitude of the perihelion)
Astronomy; General astronomy
Angular distance (measured in the plane of the object's orbit and in the direction of its motion) from the ascending node to the perihelion point.
array telescope
Astronomy; General astronomy
a telescope composed of an array of separete individual elements acting in concert
arsenic (As, 4S3/2 in ground state)
Astronomy; General astronomy
a metalloid element with two main forms, grey α arsenic and β arsenic
