A Wedge

One of the simple machines; a piece of material, such as metal or wood, thick at one edge and tapered to a thin edge at the other for insertion in a narrow crevice, used for splitting, tightening, securing, or levering. Wedge - Wikipedia
A piece (of food, metal, wood etc.) having this shape.
(geometry) A five-sided polyhedron with a rectangular base, two rectangular or trapezoidal sides meeting in an edge, and two triangular ends. Wedge (geometry) - Wikipedia
(figuratively) Something that creates a division, gap or distance between things.
(archaic) A flank of cavalry acting to split some portion of an opposing army, charging in an inverted V formation.
(golf) A type of iron club used for short, high trajectories.
A group of geese, swans or other birds when they are in flight in a V formation.
One of a pair of wedge-heeled shoes.
(colloquial, Britain) A quantity of money.
(US, regional) A sandwich made on a long, cylindrical roll.
(typography, US) háček
(phonetics) The IPA character ʌ, which denotes an open-mid back unrounded vowel.
(mathematics) The symbol ∧, denoting a meet (infimum) operation or logical conjunction.
(meteorology) A wedge tornado.
(finance) A market trend characterized by a contracting range in prices coupled with an upward trend in prices (a rising wedge) or a downward trend in prices (a falling wedge).

Synonyms

(group of geese): skein

(phonetics: IPA character ⟨ʌ⟩): turned v