In The Unicode Standard, Miao script implementation is discussed in  Chapter 18 East Asia.

The Miao script was encoded in The Unicode Standard version 6.1. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Miao 16F00..16F9F 6.1  U16F00.pdf

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

1997-05-21 Proposal to add Pollard to ISO/IEC 10646 — John H. Jenkins ( L2/97-104)

2007-09-14 Preliminary proposal for encoding the Northeastern Yunnan Simple Miao script — China N.B. ( WG2 N3335,  L2/07-299)

2007-10-10 Feedback on L2/07-299 Preliminary Proposal for Northeastern Yunnan Simple Miao (WG2 N3335) — Deborah Anderson ( L2/07-352)

2009-10-01 Proposal for encoding the Miao Script — China N.B. ( WG2 N3669,  L2/09-253)

2009-10-28 Miao Ad-Hoc Meeting Report — WG2 ( WG2 N3730,  L2/09-415)

2010-01-28 Toward a proposal for encoding the Miao script in the SMP of the UCS — Michael Everson, Erich Fickle, Martin Hosken ( WG2 N3761,  L2/10-049)

2010-03-26 Final proposal for encoding the Miao script in the SMP of the UCS — China, Ireland, UK ( WG2 N3789,  L2/10-093)

2010-08-08 Proposal for encoding additional Miao characters in the SMP of the UCS — Michael Everson, Erich Fickle ( WG2 N3877,  L2/10-302)