Ah-il and Ah-ral
Cloth is measured in the ah-il, which is the length from the elbow to the tip of the middle finger, and the ah-rah, which is ten ah-ils.
Tribesmen of Gor, pg. 50, by John Norman.

Direction
"For purposes of convenience I am recounting directions in English terms, thinking it would be considerably difficult for the reader to follow references to the Gorean compass. Briefly, for those it might interest, all directions on the planet are calculated from the Sardar Mountains, which for the purposes of calculating direction play a role analogous to our north pole; the two main directions, so to speak, in the Gorean way of thinking are Ta-Sardar-Var and Ta-Sardar-Ki- Var, or as one would normally say, Var and Ki-Var; 'Var' means a turning and 'Ki' signifies negation; thus, rather literally, one might speak of 'turning to the Sardar' and 'not turning to the Sardar', some- thing like either facing north or not facing north; on the other hand, more helpfully, the Gorean compass is divided into eight, as opposed to our four, main quadrants, or better said, divisions, and each of these itself is of course subdivided. There is also a system of latitude and longitude figured on the basis of the Gorean day, calculated in Ahn, twenty of which constitute a Gorean day, and Ehn and Ihn, which are subdivisions of the Ahn, or Gorean hour. Ta-Sardar-Var is a direction which appears on all Gorean maps; Ta-Sardar-Ki-Var, of course, never appears on a map, since it would be any direction which is not Ta-Sardar-Var. Accordingly, the main divisions of the map are Ta-Sardar-Var, and the other seven; taking the Sardar as our "north pole" the other directions, clockwise as Earth clocks move (Gorean clock hands move in the opposite direction) would be, first, Ta-Sardar-Var, then, in order, Ror, Rim, Tun, Vask (sometimes spoken of as Verus Var. or the true turning away), Cart, Klim, and Kail, and then again, of course, Ta-Sardar-Var. The Cartius River incidentally, mentioned earlier, was named for the direction it lies from the city of Ar."
Nomads of Gor, pg. 3 (footnote), by John Norman.

Gorean foot
"The Gorean foot is, in my estimation, just slightly longer than the Earth foot; based on the supposition that each of its ten Horts is roughly one and one-quarter inches long, I would give the Gorean foot a length of roughly twelve and one-half inches, Earth measure."
Raiders of Gor, pg. 127, by John Norman.

Pasang
"The pasang is a measure of distance on Gor, equivalent approximately to .7 of a mile."
Tarnsman of Gor, pg. 58, by John Norman.

Tef
"A handful with the five fingers closed, not open, is a tef. Six such handfuls constitutes a tefa, which is a tiny basket. Five such baskets constitutes a huda."
Tribesmen of Gor, pg. 46, by John Norman.

Talu
"There are few water bags. Those that exist are of one talu. They are guarded." Water at Klima is generally carried in narrow buckets, on wooden yokes, with dippers attached, for the slaves. A talu is approximately two gallons. A talu bag is a small bag. It is the sort carried by a nomad herding verr afoot in the vicinity of his camp.."
Tribesmen of Gor, pg. 242, by John Norman.

Weight
"I have calculated this figure from the Weight, a Gorean unit of measurement based on the Stone, which is about four earth pounds. A Weight in ten Stone. "
Raiders of Gor, pg. 127, by John Norman.