Editing Single UNIX Specification (section)

==Marks for compliant systems==
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There are five official marks for conforming systems:<ref>{{cite web|url=https://www.opengroup.org/openbrand/register/|title=UNIX(R) Certified Products - The Open Group official register of UNIX Certified Products|website=[[The Open Group]]}}</ref><ref>{{cite web|url=https://www.opengroup.org/openbrand/register/index2.html|title=The Open Brand - The full register of certified products|website=[[The Open Group]]}}</ref>
* UNIX 93<ref name="UNIX_93">{{cite web| title=The Open Brand Register, UNIX 93|url=https://www.opengroup.org/openbrand/register/xt.htm|website=[[The Open Group]]}}</ref>
* UNIX 95 - the mark for systems conforming to version 1 of the SUS<ref name="UNIX_95">{{cite web| title=The Open Brand Register, UNIX 95|url=https://www.opengroup.org/openbrand/register/xu.htm|website=[[The Open Group]]}}</ref>
* UNIX 98 - the mark for systems conforming to version 2 of the SUS<ref name="UNIX_98">{{cite web| title=The Open Brand Register, UNIX 98|url=https://www.opengroup.org/openbrand/register/xx.htm|website=[[The Open Group]]}}</ref>
* UNIX 03 - the mark for systems conforming to version 3 of the SUS<ref name="UNIX_03">{{cite web| title=The Open Brand Register, UNIX 03|url=https://www.opengroup.org/openbrand/register/xy.htm|website=[[The Open Group]]}}</ref>
* UNIX V7 - the mark for systems conforming to version 4 of the SUS (including Corrigenda)<ref name="UNIX_V7">{{cite web| title=The Open Brand Register, UNIX V7|url=https://www.opengroup.org/openbrand/register/xv7.htm|website=[[The Open Group]]}}</ref><ref>{{cite web|url=https://unix.org/unixv7.html|title=The UNIX System -- UNIX V7 Certification|website=unix.org}}</ref>