Set of Quaternions Symbol

U+210D

\mathbb{H}

The set of quaternions symbol (ℍ) is used in math to represent the set of quaternions. Typically, the symbol appears in an expression like this:

In plain language, this expression means the variable represents a quaternion number that is contained within the set of quaternions.

Quaternions are a four-dimensional extension of the complex numbers, where each quaternion can be expressed as , where are real numbers and are the fundamental quaternion units.

Latin Capital Letter H | Symbol

The capital Latin letter H.

Set of Complex Numbers | Symbol

The set of complex numbers is represented by the Latin capital letter C. The symbol is often presented with a double-struck font face just as with other number sets. The set of complex numbers extends the real numbers.

Set of Real Numbers | Symbol

The set of real numbers symbol is a Latin capital R presented in double-struck typeface.