PARASANG (Gr. παρασύγγης; Persian farsang), a lineal measure among the Persians, frequently alluded to by Greek writers. Owing to the original indefiniteness of itinerary distances, it seems to have differed considerably at different times. The estimate of its length most commonly received is that given by Herodotus, Suidas, Hesychius, and Xenophon, and which is equivalent to about 30 Greek stadia, or 3½ English miles. Rödiger, in Ersch u. Gruber's Encyclopædie, takes the word to be connected with the Persian sang, a stone, in allusion to the stones which were placed at certain intervals on the public roads in that country to indicate distances, after the manner of our mile-stones.