In The Unicode Standard, Coptic script implementation is discussed in Chapter 7 Europe-I.
Prior to version 4.1 of The Unicode Standard, the Coptic script was considered a stylistic variant of the Greek script, and a unified Greek and Coptic block in the range U+03E2..U+03EF contained the Coptic characters which could not arguably be written with Greek letters. However, subsequent discussion determined that the two scripts would be better encoded separately, so version 4.1 added a Coptic block which contained characters needed for accurately processing Coptic text.
The Coptic script is now encoded in the following blocks:
See also "Unicode Status (Combining marks)" for combining marks used in Coptic writings.
Subsequent to version 4.1, the following characters have been added to the Coptic script:
Documentation refers to ISO Working Group and Unicode proposals
A number of proposals for its inclusion were submitted to the Unicode Technical Committee and WG2:
1997-12-08 Proposal to encode Coptic in ISO/IEC 10646 — Michael Everson ( WG2 N1658.htm, L2/98-022 (not online))
2000-02-15 Scripts from the Past in Future Versions of Unicode — Carl-Martin Bunz ( L2/00-128)
2000-04-26 Further comments on historic scripts — Carl-Martin Bunz ( L2/00-153)
2000-10-05 Coptic – resolutions from the meeting in Leiden, September 2, 2000 — Prof. Stephen Emmel ( L2/00-411)
2002-02-03 Coptic Disunification — Rick McGowan ( L2/02-051)
2003-06-13 Proposal to Encode Coptic Letter Eie for use in Textual Apparatus Peter Constable ( L2/03-208)
2003-08-24 Proposal to add the Coptic alphabet to the BMP of the UCS — Michael Everson ( L2/03-283)
2003-10-19 Background on DOUBLE OBLIQUE HYPHEN — Deborah Anderson ( L2/03-347)
2004-01-26 Changes to ISO/IEC JTC1/SC2/WG2 N2636 and N2676 recommended by the International Association for Coptic Studies Stephen Emmel ( L2/04-053)
2004-02-02 Coptic Comments — Kamal Mansour ( L2/04-068)
2007-05-12 Proposal to add additional characters for Coptic and Latin to the UCS — Michael Everson, Stephen Emmel, Antti Marjanen, Ismo Dunderberg, John Baines, Susana Pedro, António Emiliano ( WG2 N3222, L2/07-085)
2009-09-15 Proposal to Encode Coptic Numerals in ISO/IEC 10646 — Anshuman Pandey ( L2/09-163)
2010-09-21 Revised proposal to add additional characters for Greek, Latin, and Coptic to the UCS — Michael Everson, Stephen Emmel, Siegfried G. Richter, Susana Pedro, António Emiliano ( WG2 N3912, L2/10-348)
2011-01-08 Opposition about encode Coptic Epact numeral system in the Unicode Standard and ISO/IEC10646 — Azzeddine Lazrek ( L2/11-035)
2011-02-09 Comparison of Coptic Epact vs. Rumi digits — Deborah Anderson ( L2/11-065)