In The Unicode Standard, Thaana Script implementation is discussed in Chapter 13 South and Central Asia-II: Other Modern Scripts.
Thaana script was first encoded in The Unicode Standard version 3.0.
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Subsequent to version 3.0, the following characters have been added to the Thaana script:
Documentation refers to ISO Working Group and Unicode proposals
A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:
1992-1993 Exploratory Proposal for Maldivian (Dihevi) — Rick McGowan ( TR3-2)
1997-05-30 Thaana proposal — Jenkins/Everson (L2/97-197 (not online))
1997-05-30 Proposal for encoding the Thaana script in ISO/IEC 10646 — Michael Everson ( WG2 N1519 (unofficial HTML version of a document submitted to WG2), L2/97-036 (not online))
1998-03-10 Revised proposal for encoding the Thaana script in the BMP of ISO/IEC 10646 — Michael Everson ( WG2 N1699, L2/98-161 (not online))
1998-05-05 Part 1:Architecture and Basic Multilingual Plane AMENDMENT 24: Thaana — WG2 ( WG2 N1824thaana)
2012-11-03 Sorting all RTL scripts together — Roozbeh Pournader ( L2/12-377)