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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

A playground or play area is a place with a specific design for children be able to play there. It may be indoors but is typically outdoors (where it may be called a tot lot in some regions...

A propeller is a type of fan which transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and air or water is accelerated behind the blade. Propeller dynamics can be modeled by both Bernoulli's principle and Newton's third law. Aircraft propellers convert rotary motion from piston engines or turboprops to provide propulsive force. They may be fixed or variable pitch...

Jeans are trousers made from denim. Jeans, originally designed for work, became popular among teenagers starting in the 1950s. Historic brands include Levi's, Lee and Wrangler. Jeans come in various types, for example, skinny jeans, boot cut, or flare. Jeans are now a very popular form of casual dress around the world, and have been so for decades. They come in many styles and colors; however, "blue jeans" are particularly identified with American culture, especially the American Old West...

Aircraft are vehicles which are able to fly by being supported by the air, or in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. Although rockets and missiles also travel through the atmosphere, most are not considered aircraft because they use rocket thrust instead of aerodynamics as the primary means of lift...