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2. Swimming pool - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool

   A swimming pool, swimming bath, wading pool, paddling pool, or simply pool, is a structure designed to hold water to enable swimming or other leisure activities. Pools can be built into the ground (in-ground pools) or built above ground (as a freestanding construction or as part of a building or other larger structure), and may be found as a ...

3. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole cover of a given diameter has a smaller surface area than a square cover of the same width, thus less material is needed to cast the manhole cover, meaning lower cost. The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic. Round castings are much ...

4. Cover (topology) - Wikipedia

   en.wikipedia.org/wiki/Cover_(topology)

   Covers are commonly used in the context of topology.If the set is a topological space, then a cover of is a collection of subsets {} of whose union is the whole space .In this case is said to cover , or that the sets cover .