In The Unicode Standard, Hanunóo script implementation is discussed in  Chapter 17 Indonesia and Oceania under Philippine scripts.

The Hanunóo script was encoded in The Unicode Standard version 3.2. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Hanunóo 1720..173F 3.2  U1720.pdf

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

1998-05-25 Proposal for encoding the Philippine script in the BMP of ISO/IEC 10646 — Michael Everson ( WG2 N1755,  L2/98-217)

1998-11-23 Revised proposal for encoding the Philippine script in the UCS — Michael Everson ( WG2 N1933,  L2/98-397,   L2/99-014)

2000-02-22 Philippino characters (status report) — Takayuki K. Sato ( WG2 N2194.doc,  L2/00-097)

2000-10-16 New draft for Philippine script with block introduction — Michael Everson ( L2/00-357)

2004-03-09 Indic scripts collation grouping; CTT suggestion — Kent Karlsson ( WG2 2716.doc,  L2/04-109)

2008-03-02 Criteria for the encoding of script-specific dandas — Unicode and US National Body ( WG2 N3457,  L2/08-118)

2011-03-03 Indonesian and Philippine Scripts and extensions not yet encoded or proposed for encoding in Unicode — Christopher Miller ( L2/11-091)