Sis forStar (shape)
A star is a shape you often see at Christmas time, as decorations on a Christmas tree. Stars are usually drawn with five or six points. You can also see stars on the flags of some countries, like the American flag.
Sis forStreak (shape)
A streak is a long, narrow band of something. A streak might be a dirty mark, a patch of color, or even a cloud formation.
A teardrop shape is the shape of a falling drop of water, like a tear falling from your eye. Teardrop shapes are often seen in jewellery.
A wedge is a triangular shaped piece of something where one end is very pointy and the opposite side is flat. Wedges are designed to be driven into places by hitting the flat end so the point is driven into a gap.
Wedges are commonly used for keeping doors open, or for driving into blocks of wood to help split them.