Here are some fonts types that are used in Atari platform
Signum!2
Signum!2 is a bitmapped font format and supported by many
wordprocessors and some drawing packages.
Signum!3
Signum!3 also a bitmapped font format and supported by many
wordprocessors and some drawing packages. It is the new
generation derived from Signum!2
Calamus
Calamus font is widely use in Atari platform as many of applications
support it, such as Calamus DTP and Digital Art's (DA's)
softwares It has the suffix .CFN