Sihmitree is a gimmick typeface in which all glyphs have reflective (mirror) or rotational symmetry (or both). Sihmitree has two weights and is caps only, with most of the lower-case letters identical to the upper-case letters. It includes only those accented characters that are symmetrical.
The letters of the alphabet are often used to explain symmetry. BCDEK are given as examples of shapes that can easily be formed with symmetry over a horizontal line. AMQTUVWY can easily be formed so that they mirror over a vertical line. Letters HIOX can be formed so they mirror over both horizontal and vertical lines, and as a result they will also have rotational symmetry. Letters NSZ can be formed so that they reproduce themselves with a rotation of 180º. That leaves letters FGJLPR, which are usually considered examples of asymmetry. However, there are script versions of J, L, and R that can be formed with symmetry, and variants of lower-case f and g can be made that are symmetrical. P looks a lot like the thorn character. Some of the numbers also present challenges when trying to form them symmetrically. The symmetrical alphabet is not stylistically harmonious and has limited use other than as an exploration of symmetry.