Altar. According to Day the right half refers to the Excellent Master degree, the left half to the Mark Master Degree. Cooper says that the diamond black and white pattern on the right “is appropriate to the Royal Arch Chapter.”
About the cipher Day is extremely lengthy. Supposedly it translates to:
I AM hath sent me
unto you. I AM that
I AM. I am the Rose
of Sharon and the Lilly
of the Vally. HE’GEE
ASHER HEJAH. I AM
that I AM or I WILL
BEE that I WILL BEE.
JAHDADAIAR.
This quote would be taken from the King James translation that was first published in 1611. Cooper says that the quote is “Further confirmation of the Excellent Master element of the panel”.