Unicode has no hexagon emoji. Its hexagons are text characters: ⬢, Black hexagon, U+2B22, and ⬡, White hexagon, U+2B21. The word hexagon is Greek, from hex, six: a six-sided polygon.
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Five, six and eight sides
A pentagon has five sides, ⬟ and ⬠, a hexagon six and an octagon eight. The octagon is the one with an emoji: 🛑, the stop sign, which in many countries is a red octagon. The plain black octagon, ⯄, dates from Unicode 7.0 of 2014, and a device without a font for it draws an empty box.
Parallelogram and trapezoid
The parallelogram symbol is ▱, U+25B1, with a filled twin, ▰: a four-sided shape with two pairs of parallel sides. The trapezoid has one character, ⏢, which Unicode names white trapezium, the British word for the shape.
ASCII has no hexagon sign: ⬡, the white hexagon, is U+2B21, far outside it.
An octagon emoticon exists as an emoji: 🛑, the stop sign.
No keyboard symbol or key exists for a hexagon, an octagon or a trapezoid.
Questions and answers
Is there a hexagon emoji?
No. Unicode has no hexagon emoji and no pentagon emoji either. The text symbols ⬡, ⬢, ⬟ and ⬠ stand in where emoticons of those shapes are wanted, and the only emoji here is the octagonal stop sign.
What is the Unicode for a hexagon?
U+2B21 is the white hexagon character ⬡ and U+2B22 the black hexagon ⬢, both added in version 5.0 of 2006. U+2B23 is the horizontal black hexagon ⬣, and U+2394 ⎔ is a hexagon under another name.
Is there an Alt code for a hexagon?
No. Neither table of Alt key codes holds a hexagon, a pentagon, an octagon or a trapezoid, and no character is named a long, elongated or oblong hexagon. The one sign here with a code is the house ⌂, Alt+127.
What is the math symbol for a parallelogram?
▱, White parallelogram, U+25B1, which HTML names ▱. ▰ is the filled form. A parallelogram is a four-sided figure with two pairs of parallel sides.
Is there a trapezoid emoji?
No emoji, but one text character: ⏢, U+23E2, White trapezium. Trapezium is the British English word and trapezoid the North American one for a four-sided shape with at least one pair of parallel sides.
All 19 hexagons and other polygons
Start here 8
⬢Black hexagonU+2B22. Six sides, solid. It is a text character, so it is drawn in the color of the words around it. Added in Unicode 5.0 (2006).
⬟Black pentagonU+2B1F. Five sides, filled. Added in Unicode 5.1 (2008).
⬣Horizontal black hexagonU+2B23. Named horizontal in the standard, to tell it from U+2B22: the solid six-sided shape in its second position.
🛑Octagonal signU+1F6D1. The one emoji in the table: an eight-sided sign that Unicode also names stop sign, noting that it may contain text indicating stop.
⎔Software-function symbolU+2394. A hexagon under another name: the unicode-math package of LaTeX calls this character \hexagon. In Unicode since version 3.0 (1999).
⬡White hexagonU+2B21. The outline hexagon, a six-sided shape as a text character. It came into the standard together with the filled one.
▱White parallelogramU+25B1. The parallelogram of math text, two pairs of parallel sides in outline. ▱ in HTML.
⬠White pentagonU+2B20. The outline pentagon, one version older than its filled twin.
Show all 19 hexagons and other polygons (11 more)
Hexagons 3
⌬Benzene ringU+232C. The hexagon of chemistry drawings, a character since version 1.1 (1993).
⏣Benzene ring with circleU+23E3. The ring drawn again with a loop set within its six sides; in the standard since version 5.0.
⬡⬡⬡Three hexagonsU+2B21 three times over, as a strip of honeycomb cells.
Pentagons 3
⭓Black right-pointing pentagonU+2B53. A pentagon with its point to the right, like a tag.
⌂HouseU+2302. The single sign here with an Alt code: Alt+127.
⭔White right-pointing pentagonU+2B54. The outline of the tag shape.
Parallelogram and trapezoid 2
▰Black parallelogramU+25B0. The filled parallelogram.
⏢White trapeziumU+23E2. The trapezoid, under the British English word for it. ⏢ in HTML.
Newer, may be an empty box 3
⯄Black octagonU+2BC4. Eight sides, filled: the plain octagon. Added in Unicode 7.0 (2014).
⯃Horizontal black octagonU+2BC3. The octagon in the position that Unicode names horizontal, from the same version.
⯂Turned black pentagonU+2BC2. Five sides again, in the position the standard calls turned; it arrived with the two octagons of this group.