# Blackboard bold

**Blackboard bold** is probably the most common way of denoting the "standard" number sets: the natural numbers, the integers and so on. In AMS-LaTeX, you use the `\mathbb{...}`

command to obtain them; the ConTeXt way is the `\blackboard{...}`

command. Also, the following commands are defined:

\naturalnumbers \integers \rationals \reals \complexes, \primes \blackboard{F} \blackboard{O}

See also Doublestroke for an alternative to the msbm font.