My interest was piqued by this question and answer. For several reasons NASA needed to refer frequently and extensively to a Martian solar day, and "sol" became the nom du jour. There have been remotely controlled rovers on the Moon as well, but I don't know in the Russian or Chinese if the corresponding word for month was used for convenience, or if a new term for Lunar day was coined for the occasion.
Solar days are important for exploring bodies. Oblique lighting (coming from a direction other than the direction of the camera) is extremely important for 3D reconstruction of the landscape for navigation. Surface conditions (liquids, slushes, venting, boiling) may be very important for a rovers mission. Except for water's freakishly high melting and boiling points (273K, 373K) the materials on the surfaces of many solar system bodies can often have phase changes at the much lower temperatures the sun produces far beyond earth's orbit. Potential ionospheric phenomena may also be of interest, and of course on some bodies it can get prohibitively cold at night.
While some landers have used and will use solar power, this is usually used to charge batteries which could easily deliver power at night. Of course some landers will cary other sources of power, including radioisotope based thermo-electric.
So my question is, besides
body_name_as_adjective + "day" (e.g. Lunar day, Martian day, etc.) has any other term been used in space exploration to refer to a solar day on a solar system body besides sol on Mars?