the strings whose notes are the lowest on the scale (the bass notes) the "low strings" or the "bottom strings."

Certainly on a normal freted plucked string instrument constructed in the normal manner and being held in the normal position by a right handed player the string tuned to the highest pitch is physically closest to the floor and the string tuned to the lowest pitch is farthest from the floor. This is why I said the bottom string in the normal dextrocentric manner of holding the instrument. The pitch of any given string would, ignoring any Einsteinian gravitaional effects due to proximity to a large mass, be unaffected by the position in which the instrument was being held. Of course in the case of the ukulele, the top string (in pitch) is on the bottom (physically) but the bottom string is immediately above it. The top string (physically) is second from the bottom (in pitch) and the bottom string (in pitch) is second from the top (physically)

Faldage minced birdseed