Complex sentence: The symbol actually used in Egyptology is, two half-rings opening to the left, since Unicode 5.1 it has been assigned its proper codepoints (uppercase U + A722 Ꜣ, lowercase U + A723 ꜣ).
Split into simpler sentences: The symbol actually used in Egyptology is, two half-rings opening to the left. Since Unicode 5.1 it has been assigned its proper codepoints (uppercase U + A722 Ꜣ, lowercase U + A723 ꜣ).