Sheepskin
From BiblePortal Wikipedia
Vine's Expository Dictionary of NT Words [1]
1: Μηλωτή (Strong'S #3374 — Noun Feminine — melote — may-lo-tay' )
from melon, "a sheep or goat," occurs in Hebrews 11:37 . In the Sept., 1—Kings 19:13,19; 2—Kings 2:8,13,14 .
Webster's Dictionary [2]
(1): ( n.) The skin of a sheep; or, leather prepared from it.
(2): ( n.) A diploma; - so called because usually written or printed on parchment prepared from the skin of the sheep.