M3AM3A. We have used the code M3A according to Inscribe and to Gardiner, Supplement to the Catalogue of the Egyptian Hieroglyphic Printing Type, Showing Acquisitions to December 1953, p. 4. In the hieroglyphica, this code is used for M3G.
M3GM3G this code is specific to JSesh, and used for the Hieroglyphica sign coded as M3A.