[scythe]

Mostly the Latin-1 subset (plus East Asian overlines and the Chinese ‘v’ tone mark) and other characters that appear in names, but also “”‘’–•—¿¡§ are all rather useful if you can get to them. The math symbols for partial, adjoint, sqrt, almost equal, not equal, equivalent, isomorphic, geq and leq are also nice; others like sum and integral are pretty but require too many decorations to be useful anyway. On OS X last time I used it if you press eg Option-u you get a hanging diaeresis and the next character you type will be umlautted if possible. You can enable this on X with [Compose]+:, but you usually have to fiddle with settings to enable it, and that’s not the Elementary philosophy.

Too often I want to use the proper spelling of someone’s name and I run off to Google to get the symbol.