In The Unicode Standard, Mongolian script implementation is discussed in  Chapter 13 South and Central Asia-II: Other Modern Scripts.

The Mongolian script was encoded in The Unicode Standard version 3.0 and unifies Mongolian and the three derivative scripts Todo, Manchu, and Sibe. Each of the three derivative scripts shares some common letters with Mongolian, and these letters are encoded only once. Each derivative script also has a number of modified letter forms or new letters, which are encoded separately. The script is encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Mongolian 1800..18AF 3.0  U1800.pdf

Subsequent to version 3.0, the following characters have been added to the Mongolian script:

CharactersUnicode VersionDocumentation
18AA 5.1  n3041.pdf/ L2/06-013
11660..1166C 9.0  L2/14-259 (background documents:  WG2 N4542 /  L2/14-067,  WG2 N4547 /  L2/14-081,  WG2 N4632 /  L2/14-240)

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:

1993-01-13 Unicode Technical Report #2 - Mongolian — Joe Becker ( TR2.html)

1998-02-15 Mongolian encoding update — WG2 (WG2 N1711 (not online), L2/98-088 (not online))

1998-03-20 Comments on the Mongolian Encoding Proposal, WG2 N1711 — Ken Whistler ( WG2 N1734, L2/98-104 (not online))

1998-04-30 Reply to "Proposal WG2 N1734" Raised at the Seattle Meeting Regarding Proposal WG2 N1711 — China N.B. ( WG2 N1808,  WG2 N1808.doc,  WG2 N1808w97.doc)

1998-08-31 Feedback on Ken Whistler's comments (N1734) on Mongolian — Richard Moore ( WG2 N1833.doc,  WG2 N1833rm.doc,  WG2 N1833rmw97.doc)

1999-02-12 Summary of Voting on SC 2 N 3208, Combined PDAM registration and consideration ballot on WD for ISO/IEC 10646-1/Amd. 29: Mongolian — Irish comments ( WG2 N1972,  L2/99-075)

1999-12-09 Final text for ISO/IEC 10646-1, Amd.#29 – Mongolian — ITTF ( L2/99-381)

2003-02-13 Use of ZWJ/ZWNJ with Mongolian Variant Selectors and Vowel Separator — Paul Nelson, Asmus Freytag ( L2/03-065)

2003-02-27 Error Report on Mongolian Vowel Separator — Tim Partridge ( L2/03-073)

2005-08-05 Proposal on Encoding Three Todo Mongolian Punctuation Marks in the BMP of ISO/IEC 10646 — China, Mongolia ( WG2 N2963,  L2/05-218)

2005-12-05 Proposal to change the script property for three Mongolian punctuation marks — Eric Muller ( L2/05-378)

2006-02-13 Proposal to encode one Manchu ali gali letter — Andrew C West ( WG2 N3041,  L2/06-013)

2006-03-27 Supporting references for WG2 N3041, Manchu Ali Gali — China N.B. ( WG2 N3092,  L2/06-285)

2010-07-06 A Survey on Rendering Traditional Mongolian Script — Biligsaikhan Batjargal, Fuminori Kimura, Akira Maeda ( L2/10-279)

2011-10-19 Proposal to assign the Extender property to U+180A MONGOLIAN NIRUGU — Laurentiu Iancu ( L2/11-401)

2012-06-01 Proposal to Add Mongolian Letters to ArabicShaping.txt — Behdad Esfahbod ( L2/12-202)

2012-10-25 Mongolian Vowel Separator — Behdad Esfahbod ( L2/12-338)

2012-11-05 Mongolian and 'Phags-Pa Shaping — Behdad Esfahbod, Roozbeh Pournader ( L2/12-360)

2012-12-20 Proposal to change General Category of MONGOLIAN VOWEL SEPARATOR from Zs to Cf — Behdad Esfahbod ( L2/13-004)

2013-05-27 Presentation of vertical scripts — WG2 Project Editor ( WG2 N4435,  L2/13-146)

2014-01-17 Encoding Mongolian head letters — Aaron Bell, Greg Eck, Andrew Glass, Andrew West ( L2/14-030)

2014-01-27 Proposal to update the code charts for Mongolian — Aaron Bell, Greg Eck, Andrew Glass ( L2/14-031)

2014-02-06 Proposal to encode five Mongolian head marks — Aaron Bell, Greg Eck, Andrew Glass, Andrew West ( WG2 N4542,  L2/14-067)

2014-02-19 Comments on N4542 Five Mongolian Head Marks — China N.B. ( WG2 N4547,  L2/14-081)

2014-09-23 A Letter to the Authors of N4542 (5 Birgas in Mongolian Block) — China NB ( WG2 N4632,  L2/14-240)

2014-10-21 WG2 Consent Docket — Ken Whistler, Deborah Anderson ( L2/14-259)

2015-07-29 U+202F NNBSP Impact on Mongolian Options — Richard Ishida ( L2/15-212)

2015-08-27 Draft Mongolian variation selectors — Michel Suignard ( L2/15-304)

2016-01-24 Mongolian Base Forms, Positional Forms, & Variant Forms — Greg Eck ( L2/16-051)

UTC #147 Minutes ( L2/16-121) (See B.14.1 for decision and action items)

2016-01-26 Mongolian discussion documents — Greg Eck ( L2/16-041)

UTC #146 Minutes ( L2/16-004) (See C.13 for decision and action items)

2016-09-19 Mongolian Base Forms, Positional Forms, & Variant Forms — Greg Eck ( L2/16-258)

2016-09-20 WG2 #65 Mongolian Discussion Points — Greg Eck, et al (WG2 N4753,  L2/16-259)

2016-09-22 Modifications to Mongolian Encoding in UCS — China, Mongolia N.B. (WG2 N4757,  L2/16-261)

2016-09-24 Comments on Mongolian, Small Khitan, and other WG2 #65 documents — Deborah Anderson, et al ( L2/16-266)

2016-10-30 Comments on the Mongolian block — Weizhe Zheng ( L2/16-292)

Recommendations to UTC #149 November 2016 on Script Proposals ( L2/16-342) (See point 11a.)

UTC #149 Minutes ( L2/16-325) (See C.5.4 for decision and action items)

2016-10-29 Mongolian ad hoc report — Deborah Anderson (WG2 N4769,  L2/16-297)

2016-10-26 Proposed additions for Mongolian in 5th edition of UCS — Chen Zhuang ( L2/16-309)

Recommendations to UTC #149 November 2016 on Script Proposals ( L2/16-342) (See point 11b.)

UTC #149 Minutes ( L2/16-325) (See C.5.6 for decision and action items)

2016-11-03 Preliminary proposal to encode four letters in Todo and Manchu Ali Gali — Weizhe Zheng ( L2/16-331)

2016-11-07 Preliminary comments on L2/16-309 — Weizhe Zheng ( L2/16-377)

Recommendations to UTC #150 January 2017 on Script Proposals ( L2/17-037) (See point 12.c.)

2017-01-13 Proposal to encode one historical Mongolian letter for Buryat Mongolian — Andrew West, Amgalan Zhamsoev, Viacheslav Zaytsev (WG2 N4781,  L2/17-007)

UTC #150 Minutes ( L2/17-016) (See C.5.1 for decision and action items)

2017-01-16 Proposal to encode one Manchu format character — Xudong Ma, Shuo Wang, Biao Jin, Jun Wang ( L2/17-008)

2017-01-16 Proposal to encode one Manchu letter — Xudong Ma, Shuo Wang, Biao Jin, Jun Wang ( L2/17-009)

2017-01-20 Encode Mongolian Suffix Connector (U+180F) To Replace Narrow Non-Breaking Space (U+202F) — Greg Eck, et al ( L2/17-036)

Recommendations to UTC #150 January 2017 on Script Proposals ( L2/17-037) (See point 12.a.)

UTC #150 Minutes ( L2/17-016) (See C.5.5 for decision and action items)

2017-01-25 Modify Standardizedvariants.txt file in the Mongolian Block U+1800 – U+18AA — Greg Eck, et al ( L2/17-035)

Recommendations to UTC #150 January 2017 on Script Proposals ( L2/17-037) (See point 12.b.)

UTC #150 Minutes ( L2/17-016) (See C.5.4 for decision and action items)

2017-01-25 Comments on L2/17-036 Mongolian Suffix Connector — Liang Hai ( L2/17-052)

2017-03-03 Proposal to Encode One Sibe Letter and One Mongolian Format Control, and Add Ten Variants to Three Mongolian Letters — Xudong Ma, Shuo Wang, Biao Jin, Jun Wang ( L2/17-063)

2017-03-03 Proposal to Change Glyphs of Mongolian Letter Manchu Ka — Xudong Ma, Shuo Wang, Biao Jin, Jun Wang ( L2/17-064)

2017-03-03 Proposal to Correct the Descriptions of Mongolian Letter Manchu Ka and Manchu Vowel Harmony — Xudong Ma, Shuo Wang, Biao Jin, Jun Wang ( L2/17-065)

2017-04-15 Mongolian Base Forms, Positional Forms, & Variant Forms — Greg Eck ( L2/17-124)

2017-04-26 Comments on L2/17-036 (MONGOLIAN SUFFIX CONNECTOR) by Liang Hai — Greg Eck ( L2/17-123)

2017-04-30 Modify Standardizedvariants.txt file in the Mongolian/Todo Block U+1800 - U+185C Phase II (revised) — Munkhdelger Dorji, Greg Eck, Badral Sanlig ( L2/17-128)

Recommendations to UTC #151 May 2017 on Script Proposals ( L2/17-153) (See point 14.)

2017-05-12 A minimum set of glyph corrections needed for the 10.0 beta Mongolian code chart — Liang Hai ( L2/17-170)

UTC #151 Minutes ( L2/17-103) (See C.5.8 for decision and action items)

2017-07-21 Script Ad Hoc report and recommendations on Mongolian — Ken Whistler, Peter Constable, Roozbeh Pournader, Liang Hai, Shen
Yilei, Zheng Weizhe, Richard Ishida, Debbie Anderson ( L2/17-243)

2017-07-27 Draft of Mongolian Shaping Rules — Chen Zhuang ( L2/17-251)