The Naxi Geba script is not yet in Unicode. The script has a tentative allocation at U+1A800..U+1AAAF in the  Roadmap to the SMP for the Unicode Standard. There seems to be disagreement on whether Naxi Dongba and Nakhi Geba should be considered the same script (see also the Unicode Status (Naxi Dongba) entry).

A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:

1992-10-30 Moso (a.k.a. Naxi, Nahsi, Nakhi) — Rick McGowan ( Unicode Technical Report #3 R2)

2001-06-14 Naxi Geba codechart — Michael Everson ( Unofficial Naxi Geba codechart)

2008-04-14 Comments on N3425 Proposal for Encoding Naxi Dongba Pictograph in the SMP of UCS — Richard Cook, Deborah Anderson ( WG2 N3442,  L2/08-169)

2008-10-14 The answer to the questions from Richard Cook and Deborah Anderson in N3442 — China N.B. ( WG2 N3543,  L2/08-378)