11 Shapes That Start With The Letter I

Are you searching for some shapes that start with the letter I? Don’t worry, you have come to the right place.

In this article, I will delve into the fascinating world of shapes and comprise a list of some common and popular shapes starting with the letter I for you.

So, without further ado, let’s discover the shapes beginning with the letter I, which will grow your geometric vocabulary skills.


Shapes That Start With Letter I

Below are the shapes that begin with the letter I (In alphabetical order):

1. Icosahedron:

The Icosahedron is a three-dimensional shape consisting of twenty equilateral triangle faces. It is a polyhedron with twelve vertices and thirty edges. The Icosahedron is a remarkable shape often encountered in fields such as crystallography, architecture, and even gaming, where its symmetrical properties create visually striking structures.

2. Incircle:

The Incircle is a circle that can be inscribed inside a polygon, touching all its sides. It is the largest circle that can fit inside the given polygon, and its center is the point of concurrency for the angle bisectors of the polygon’s interior angles. The Incircle plays a significant role in geometry, particularly in solving problems related to tangents, area calculations, and determining properties of polygons.

3. Infinity Symbol:

The Infinity Symbol (∞) is a shape that represents the concept of infinity or limitless possibilities. Its form resembles a horizontal figure-eight. The Infinity Symbol is widely recognized and used in various fields, including mathematics, physics, and philosophy, to signify unboundedness, eternal cycles, and infinite potential.

4. Intersecting Lines:

Intersecting Lines are two or more lines that meet or cross at a common point. They form angles and create intersections where they converge. Intersecting Lines are fundamental in geometry and are essential for understanding concepts such as angles, angles formed by parallel lines, and the properties of polygons.

5. Interval:

An Interval is a segment or a range between two points on a number line. It consists of all the numbers that lie between the given endpoints, including the endpoints themselves. Intervals are commonly used in mathematics, particularly in calculus and analysis, to represent sets of real numbers and solve problems involving inequalities and functions.

6. Inverted Bell:

The Inverted Bell is a shape that resembles the silhouette of an upside-down bell or a convex curve with a broader base and a narrower top. This shape is encountered in various contexts, such as musical instruments, architectural elements, and even in statistical analysis when referring to certain probability distributions.

7. Inverted Cone:

The Inverted Cone is a cone-shaped object flipped upside down, resulting in a shape with a wider circular base and a pointed top. This shape is found in various practical applications, such as lampshades, funnels, and even volcanoes. The Inverted Cone is characterized by its tapering structure and its ability to direct or channel objects toward a specific point.

8. Inverted Pyramid:

The Inverted Pyramid is a pyramid-shaped object turned upside down, where the base is narrower than the top. It is characterized by its wide top surface and tapering sides that converge to a point at the bottom. The Inverted Pyramid is often used in architecture and design, symbolizing stability, strength, and creating visually striking structures.

9. Inverted Trapezium:

The Inverted Trapezium, also known as an upside-down trapezoid, is a shape with two parallel sides and two non-parallel sides, where the parallel sides are shorter than the non-parallel sides. This shape is encountered in various fields, including architecture, engineering, and art, and its unique structure offers design possibilities and aesthetic appeal.

10. Irregular Polygon:

An Irregular Polygon is a polygon with sides of different lengths and angles that are not equal. Unlike regular polygons, irregular polygons lack symmetry and have varying degrees of complexity. Irregular polygons can have any number of sides, and their diverse shapes make them interesting subjects for study in geometry.

11. Isosceles Triangle:

The Isosceles Triangle is a triangle with two sides of equal length and two corresponding angles that are equal. It is a fundamental shape in geometry and is often encountered in various applications, such as architecture, engineering, and navigation. The Isosceles Triangle exhibits symmetry and possesses unique properties that make it a versatile and essential shape to understand.


Hope you found this article about “shapes that start with I” educative and helpful.

Do you know any other shapes that start with the letter I, that didn’t make the list?

Feel free to leave a comment below with the missing shapes and I’ll update the list as soon as possible.

And, if you are looking for other shapes that start with other letters, make sure to check my blog posts. Such as:

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