Joseph, Oliver Cowdery, and W.W. Phelps are recorded as laboring on the on "Egyptian alphabet."
Joseph Smith, Journal, 1835–1836 (1 October 1835), 3, The Joseph Smith Papers website, accessed August 11, 2021
October 1, 1835. This after noon labored on the Egyptian alphabet, in company with brsr O[liver] Cowdery and W[illiam] W. Phelps: The system of astronomy was unfolded.