23 Letters of Ancient Hebrew
23 Letters in Hebrew Alphabet
The old Hebrew Alphabet is listed as columns of 6 rather than columns of 3 or 9.
Aleph Beyt Gam Dal Hey Waw
Gimel Dalet
Zan Hhets Thet YadKaph Lam
Lamed
Mah Nun Sin Alm Pey Tsad
Mem Nun SamehhAyin Tsadey
Quph Resh Shin Taw Ghah
Ayin
The last letter of the old Hebrew alphabet was Ghah (Ayin).