more glyphs proposed by Simon Foster: 0x002713, 0x002717, 0x002af4, 0x002afb, 0x002afd;
corresponding symbols and latex macros;

--- a/Admin/components/components.sha1	Mon Mar 22 10:49:51 2021 +0000
+++ b/Admin/components/components.sha1	Mon Mar 22 17:24:42 2021 +0100
@@ -114,6 +114,7 @@
 3ff9195aab574fc75ca3b77af0adb33f9b6d7b74  isabelle_fonts-20210318.tar.gz
 b166b4bd583b6442a5d75eab06f7adbb66919d6d  isabelle_fonts-20210319.tar.gz
 9467ad54a9ac10a6e7e8db5458d8d2a5516eba96  isabelle_fonts-20210321.tar.gz
+1f7a0b9829ecac6552b21e995ad0f0ac168634f3  isabelle_fonts-20210322.tar.gz
 0b2206f914336dec4923dd0479d8cee4b904f544  jdk-11+28.tar.gz
 e12574d838ed55ef2845acf1152329572ab0cc56  jdk-11.0.10+9.tar.gz
 3e05213cad47dbef52804fe329395db9b4e57f39  jdk-11.0.2+9.tar.gz

--- a/Admin/components/main	Mon Mar 22 10:49:51 2021 +0000
+++ b/Admin/components/main	Mon Mar 22 17:24:42 2021 +0100
@@ -5,7 +5,7 @@
 cvc4-1.8
 e-2.5-1
 flatlaf-1.0
-isabelle_fonts-20210321
+isabelle_fonts-20210322
 jdk-15.0.2+7
 jedit_build-20210201
 jfreechart-1.5.1

--- a/Admin/isabelle_fonts/IsabelleSymbols.sfd	Mon Mar 22 10:49:51 2021 +0000
+++ b/Admin/isabelle_fonts/IsabelleSymbols.sfd	Mon Mar 22 17:24:42 2021 +0100
@@ -20,7 +20,7 @@
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 OS2_UseTypoMetrics: 1
 CreationTime: 1050361371
-ModificationTime: 1616358903
+ModificationTime: 1616429436
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 TTFWeight: 400
 TTFWidth: 5
@@ -2242,11 +2242,11 @@
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+WinInfo: 10980 12 6
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-BeginChars: 1114189 1458
+BeginChars: 1114189 1462
 
 StartChar: u10000
 Encoding: 65536 65536 0
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@@ -63470,5 +63471,158 @@
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--- a/Admin/isabelle_fonts/IsabelleSymbolsBold.sfd	Mon Mar 22 10:49:51 2021 +0000
+++ b/Admin/isabelle_fonts/IsabelleSymbolsBold.sfd	Mon Mar 22 17:24:42 2021 +0100
@@ -21,7 +21,7 @@
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 OS2_UseTypoMetrics: 1
 CreationTime: 1050374980
-ModificationTime: 1616363616
+ModificationTime: 1616429477
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 TTFWeight: 700
 TTFWidth: 5
@@ -1679,10 +1679,10 @@
 DisplaySize: -96
 AntiAlias: 1
 FitToEm: 1
-WinInfo: 8448 11 8
+WinInfo: 10978 11 8
 BeginPrivate: 0
 EndPrivate
-BeginChars: 1114115 1446
+BeginChars: 1114115 1450
 
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 Encoding: 1114112 -1 0
@@ -70332,43 +70332,44 @@
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--- a/Admin/isabelle_fonts/README	Mon Mar 22 10:49:51 2021 +0000
+++ b/Admin/isabelle_fonts/README	Mon Mar 22 17:24:42 2021 +0100
@@ -20,7 +20,7 @@
 
 
     Makarius
-    21-Mar-2021
+    22-Mar-2021
 
 
 ----------------------------------------------------------------------------

--- a/etc/symbols	Mon Mar 22 10:49:51 2021 +0000
+++ b/etc/symbols	Mon Mar 22 17:24:42 2021 +0100
@@ -301,6 +301,8 @@
 \<preceq>               code: 0x00227c  group: relation
 \<succeq>               code: 0x00227d  group: relation
 \<parallel>             code: 0x002225  group: punctuation  abbrev: ||
+\<interleave>           code: 0x002af4  group: punctuation  abbrev: ||
+\<sslash>               code: 0x002afd  group: punctuation  abbrev: ||
 \<bar>                  code: 0x0000a6  group: punctuation  abbrev: ||
 \<bbar>                 code: 0x002aff  group: punctuation  abbrev: ||
 \<plusminus>            code: 0x0000b1  group: operator
@@ -409,6 +411,8 @@
 \<^cancel>              code: 0x002326  group: document  argument: cartouche  font: Isabelle␣DejaVu␣Sans␣Mono
 \<^latex>                               group: document  argument: cartouche
 \<^marker>              code: 0x002710  group: document  argument: cartouche  font: Isabelle␣DejaVu␣Sans␣Mono
+\<checkmark>            code: 0x002713
+\<crossmark>            code: 0x002717
 \<open>                 code: 0x002039  group: punctuation  font: Isabelle␣DejaVu␣Sans␣Mono  abbrev: <<
 \<close>                code: 0x00203a  group: punctuation  font: Isabelle␣DejaVu␣Sans␣Mono  abbrev: >>
 \<^here>                code: 0x002302  font: Isabelle␣DejaVu␣Sans␣Mono

--- a/lib/texinputs/isabellesym.sty	Mon Mar 22 10:49:51 2021 +0000
+++ b/lib/texinputs/isabellesym.sty	Mon Mar 22 17:24:42 2021 +0100
@@ -303,6 +303,8 @@
 \newcommand{\isasympreceq}{\isamath{\preceq}}
 \newcommand{\isasymsucceq}{\isamath{\succeq}}
 \newcommand{\isasymparallel}{\isamath{\parallel}}
+\newcommand{\isasyminterleace}{\isamath{\interleave}}  %requires stmaryrd
+\newcommand{\isasymsslash}{\isamath{\sslash}}  %requires stmaryrd
 \newcommand{\isasymbar}{\isamath{\mid}}
 \newcommand{\isasymbbar}{\isamath{[\mskip-1.5mu]}}
 \newcommand{\isasymplusminus}{\isamath{\pm}}
@@ -416,10 +418,11 @@
 \newcommand{\isasymhole}{\isatext{\normalfont\rmfamily\wasylozenge}}  %requires wasysym
 \newcommand{\isasymnewline}{\isatext{\fbox{$\hookleftarrow$}}}
 \newcommand{\isasymcomment}{\isatext{\isastylecmt---}}
+\newcommand{\isasymproof}{\isamath{\,\langle\mathit{proof}\rangle}}
 \newcommand{\isasymopen}{\isatext{\guilsinglleft}}
 \newcommand{\isasymclose}{\isatext{\guilsinglright}}
-\newcommand{\isasymproof}{\isamath{\,\langle\mathit{proof}\rangle}}
-
+\newcommand{\isasymcheckmark}{\isatext{\ding{51}}}  %requires pifont
+\newcommand{\isasymcrossmark}{\isatext{\ding{55}}}  %requires pifont
 \newcommand{\isactrlmarker}{\isatext{\ding{48}}}  %requires pifont
 \newcommand{\isactrlassert}{\isakeywordcontrol{assert}}
 \newcommand{\isactrlcancel}{\isakeywordcontrol{cancel}}

--- a/src/Doc/Isar_Ref/document/root.tex	Mon Mar 22 10:49:51 2021 +0000
+++ b/src/Doc/Isar_Ref/document/root.tex	Mon Mar 22 17:24:42 2021 +0100
@@ -7,7 +7,7 @@
 \usepackage{eurosym}
 \usepackage{pifont}
 \usepackage[english]{babel}
-\usepackage[only,bigsqcap,fatsemi]{stmaryrd}
+\usepackage[only,bigsqcap,fatsemi,interleave,sslash]{stmaryrd}
 \usepackage{graphicx}
 \let\intorig=\int  %iman.sty redefines \int
 \usepackage{iman,extra,isar,proof}

--- a/src/Pure/Admin/build_fonts.scala	Mon Mar 22 10:49:51 2021 +0000
+++ b/src/Pure/Admin/build_fonts.scala	Mon Mar 22 17:24:42 2021 +0100
@@ -90,6 +90,8 @@
         0x266d,  // musical flat
         0x266e,  // musical natural
         0x266f,  // musical sharp
+        0x2713,  // check mark
+        0x2717,  // ballot X
         0x2756,  // UNDEFINED
         0x2759,  // BOLD
         0x27a7,  // DESCR

--- a/src/Pure/Tools/mkroot.scala	Mon Mar 22 10:49:51 2021 +0000
+++ b/src/Pure/Tools/mkroot.scala	Mon Mar 22 17:24:42 2021 +0100
@@ -85,7 +85,7 @@
 %\""" + """usepackage{eurosym}
   %for \<euro>
 
-%\""" + """usepackage[only,bigsqcap,fatsemi]{stmaryrd}
+%\""" + """usepackage[only,bigsqcap,fatsemi,interleave,sslash]{stmaryrd}
   %for \<Sqinter>, \<Zsemi>
 
 %\""" + """usepackage{eufrak}