Some letters, such as X, H, and O, have **both vertical and horizontal symmetry lines**. Some, like P, R, and N, have **no symmetry lines**. Others may have one or more missing lines of symmetry.

In chemistry, the presence of a chiral center means that the molecule has **no overall mirror image** (or enantiomer). A racemic mixture will contain equal amounts of each enantiomer, so it would not be considered chiral. Achiral molecules do not fit this description. They can be described as having "mirror image" planes of symmetry which intersect at right angles; these are called crystallographic axes. All carbon atoms in an achiral molecule possess identical faces, so they cannot be said to have "handedness".

For example, the carbon atom in the tetrahydrofuran ring system is chiral because there is no mirror image plane that could be drawn through it to give a complete picture of the molecule. However, the four carbons in tetrahydrofuran can be divided into two pairs, each pair having identical connections to other atoms within the molecule. These pairs of equivalent atoms can be thought of as having "hand" - either left- or right-handed depending on which pair you look at.

Letters such as B and D have a horizontal line of symmetry, which means that their top and bottom sections match. Symmetry is an important feature in design to avoid repetition.

Symmetrical letters can be used in logos to give it some structure and make it more appealing to the eye. They also help to differentiate one business from another if used appropriately. For example, a medical practice could use a symmetrical letter for its logo to show that they offer a wide range of services for **their patients**.

There are many ways that letters can be symmetrical. Here are two examples:

The letter B is symmetrical because its upper and lower parts match. So if you were to break up **the letter B**, put it back together again, and replace each piece with **its mirror image**, then it would still look like a B!

The letter M is also symmetrical because its left and right sides match. If you were to split up **the letter M** into **two separate pieces**, then put them back together again, there's a good chance that they would look just like they did before you broke them up!

The same may be said about the letter M. Letters such as B and D have a horizontal line of symmetry, which means that their top and bottom sections match. These last three letters are called asymmetric.

In mathematics and physics, an object or phenomenon with **symmetrical properties** is said to have **line symmetry**. Thus, a line is considered to have line symmetry.

An example object with **line symmetry** is a rod. Other examples include wires, tubes, and arrows. Objects without **symmetry lines** (such as spheres) cannot have line symmetry.

People can recognize letters with line symmetry because they assume that the top and bottom belong to one symbol and not two separate ones. For example, when reading the word MANY, people assume that the bottom M is part of the top N.

Line-symmetric objects are important in science and technology. For example, rods are used as **support beams** in buildings and bridges. Wires are used to transmit electricity. Tubes are used to transport fluids such as water and oil. Arrows are used to indicate a direction or purpose. Lines are also important in geometry; thus, lines with symmetry are essential in mathematics.

As you can see, letters with **line symmetry** are useful tools for scientists to communicate ideas.

Lines of symmetry can also be found in letters, either vertically or horizontally. A, H, I, M, O, T, U, V, W, X, and Y are examples of letters with a vertical line of symmetry. B, C, D, E, H, I, K, O, S, and X are examples of letters with a horizontal line of symmetry. There are also several other letters that have been discovered since this list was created that show symmetry, such as Z, Q, J, F, G, P, R, L, K, and M.

It is possible to describe any letter with a line of symmetry by referring to one of the two points on the line where it crosses itself. If we were to draw **such a line** inside a piece of paper, it would form a symmetrical pattern. For example, if we were to cut out the V from the paper and put it back into **its original position**, it would still form **a perfect V shape**.

There are two types of lines of symmetry: vertical and horizontal. A vertical line of symmetry means that if you were to rotate the letter 90 degrees clockwise or counterclockwise, it would look exactly the same. This is shown in the diagram below with the black line marking the vertical line of symmetry for the V.

A horizontal line of symmetry means that if you were to reflect the letter across **the center point** of the page, it would look exactly the same.

Expert Verified X has two lines of symmetry, whereas the other has one. At least one line of symmetry has the following letters: A, B, C, D, E, H, I, M, O, T, U, V, W, X, Y. (you can choose one).

The uppercase letters H, I, O, and X all have symmetrical horizontal and vertical lines. These letters are called "symmetric" or "balanced" letters.

The lowercase letters b, d, f, g, j, k, l, m, p, q, r, s, t, v, and w are also balanced letters. They too have **horizontal and vertical lines** that are equally strong and well-defined.

Symmetry is important in writing and designing **good-looking text**. Without it, a letterform will look flat and uninteresting. With symmetry, a letterform can be aesthetically pleasing with its various parts being equal in size and strength.

There are two types of symmetry: geometric and visual. Geometric symmetry has exact replicas of elements at opposite ends of an axis line (such as **the horizontal line** in this illustration). Visual symmetry has elements that appear the same but may not be exactly alike (such as the top and bottom halves of this letter).

For example, the word "theater" is composed of **three equal parts** that are arranged in a triangular pattern.

The remaining letters, A, B, C, D, and E, have only one line of symmetry. The A has a vertical line of symmetry, whereas the B, C, D, and E have a horizontal line. J, K, L, N, and P have **no symmetry lines**.

The A is the only letter that does not reflect across **its center point**. All the other letters are symmetrical about a vertical or a horizontal line through **their centers**.

Thus, the letter K is the only letter that doesn't share its reflection with any other letter. Therefore, it is the only letter that has complete reflective symmetry.