A shape with a hole in it is called a "torus." It resembles a donut-shaped figure, with a hole in the middle that runs through the center.
a bum hole is round depends what has been inserted into it, but normally it resembles a closed draw string : )
A hole puncher.
Black holes are always there. they are found in the centres of massive galaxies and also floating in space.
tho hole in the toilet
Allen Key or Hex Key
Memory hole
Allen Screw
A bored hole latrine is an outside toilet that is dug with an auger device. A common latrine is usually dug by hand with shovels or by construction equipment.
A standard hole puncher typically weighs around 200-300 grams, depending on the material and size of the device.
A special tool having a cross section of 'Reuleaux triangle' when mounted in a floating chuck can trace the shape of square.. Refer this for more details: http://www.slideshare.net/Arahvinth/square-hole
Pin-hole camera (camera obscurer)