### shapes | round shape | spheroid:

Oblate spheroid
* are a rotationally symmetric.
* have rotational symmetry around an axis from pole to pole.
  * An 'oblate spheroid' shape like a sphere, but the distance from pole to pole is less than the distance around the equator. It is flatter than a true sphere. Skittles candies are examples of oblate spheroids. Go stones are another example. Oblate spheroids are a rotationally symmetric.

### shapes | round shape:

Vortex
* Some vortices grow in size at the cost of others.
* Vortices are excitations in the array
  - of the array in the form of eddy-current patterns
  - fundamental excitations of gases and liquids
  - generic features of geophysical flows
  - lines of singularity for the velocity field of a fluid
  - more likely to form in sprues with round or square cross-sections
  - of crucial importance in understanding many of the superfluid properties
  - predominantly anticyclonic
  - quite common in aerodynamics
  - shed at the bell margin resulting in a turbulent wake behind the swimming medusa
  - spinning strings
  - can be powerful enough to roll business jets and airliners and cause structural damage
  - form along the interface and interact before being lost to numerical diffusion
* also trap water from the engines, which explains the ribbons of vapour.
* are roller coasters.
* created by insects rapidly flapping their wings whip the air into a frenzy.
* regimes around a freely vibrating cylinder in oscillatory flow.

Sharpness
* estimates the intrinsic angular size of the measured object outside the atmosphere.
* increases productivity.
* is also a factor of the focus of all three color elements
  - intelligence
* physical property.

Sheath
* Some sheaths absorb water.
* Some sheaths contain chloroplasts
  - membranes
* Some sheaths protect claws
  - plants
* Some sheaths surround cell membranes
  - feathers
  - follicles
  - lungs
  - nerves
* are covering
  - protective covering
  - the waxy casings that protect feathers as they develop
* cover root tips
* form around their clitellums, which dry and fill with albumin.
* includes sections.
* is protection
* provide protection.
* provides a passageway for genetic material to be passed into the host bacteria.

### sheath:

Leaf sheath
* Some leaf sheaths have margins
  - protect plants
* are also susceptible to attack
  - open, cylindrical and without auricles
  - short and break down into a fibrous interwoven mass as they age
  - somewhat compressed and flattened, without hairs

Myelin sheath
* Many myelin sheaths make up a dendrite.
* Some myelin sheaths contain membranes.
* Some myelin sheaths provide electrical insulation
  - surround nerves

Sheet metal
* has no specific thickness.
* is A. soft steel sheets that are covered with zinc
  - an artifact
  - usually electroplate

### sheet metal:

Flashing
* are sheet metal
  - the edges around anything that interrupt the field
* is briefly and evenly exposing photographic materials to white light
  - the metal stripping that forms a barrier around chimneys, roof vents, or skylights
  - their way of advertising that they are available
  - where a roof or wall meets a chimney or skylight
* refers to shiny edges on ware, often produced by overfiring.

Tin plate
* is sheet metal
  - used primarily in canmaking
* sheet of iron coated with tin to keep it from rusting.