At 2023-06-17T05:19:46+1000, Damian McGuckin wrote: There are a few others, but they postdate Ossanna troff. From groff_char(7) in 1.23.0.rc4: ϵ \[+e] u03F5 variant epsilon (lunate) ϑ \[+h] u03D1 variant theta (cursive form) ϖ \[+p] u03D6 variant pi (similar to omega) φ \[+f] u03C6 variant phi (curly shape) ς \[ts] u03C2 terminal lowercase sigma + I know of no reason to make these generally available by default in eqn, though, any more than they already are. You can type their special characters in eqn input and assign spacing and style types to them. (This typing system is a GNU eqn feature, not present in AT&T eqn). In fact I have a coupled pair of reforms in mind for GNU eqn: unfastening the definitions of the lowercase Greek special characters from the typeface used for letters (variables), and then defining the lowercase Greek letter eqn macro names ("alpha", "beta", ...) to explicitly use the "letter" style type. https://savannah.gnu.org/bugs/?64232 https://savannah.gnu.org/bugs/?64231 (For example: define alpha ! type "letter" \(*a ! ) This should result in no change for historical documents (except on terminals, where it will fix a bug), and give us some flexibility for users of modern fonts where Greek letters are properly supported in text fonts (i.e., in four styles). The Graphic Systems C/A/T had uppercase Greek available _only_ upright and lowercase Greek _only_ italic. Modern typesetting systems are not so limited. Regards, Branden