diff --git a/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_overbrace.svg b/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_overbrace.svg
new file mode 100644
index 0000000000..97b40d5ba5
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_overbrace.svg
@@ -0,0 +1,21 @@
+
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_underbar.svg b/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_underbar.svg
new file mode 100644
index 0000000000..57bdd1a9a3
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_underbar.svg
@@ -0,0 +1,15 @@
+
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_underbrace.svg b/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_underbrace.svg
new file mode 100644
index 0000000000..ffef47246d
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/liii-night/16x16/focus/tm_underbrace.svg
@@ -0,0 +1,28 @@
+
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_overbrace.svg b/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_overbrace.svg
new file mode 100644
index 0000000000..95efeedff7
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_overbrace.svg
@@ -0,0 +1,21 @@
+
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbar.svg b/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbar.svg
new file mode 100644
index 0000000000..aa6588cf95
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbar.svg
@@ -0,0 +1,15 @@
+
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbrace.svg b/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbrace.svg
new file mode 100644
index 0000000000..a4fb0dfc92
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbrace.svg
@@ -0,0 +1,27 @@
+
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_overbrace.xpm b/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_overbrace.xpm
new file mode 100644
index 0000000000..b09644219e
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_overbrace.xpm
@@ -0,0 +1,38 @@
+/* XPM */
+static char *a_overbrace_sharp[] = {
+/* columns rows colors chars-per-pixel */
+"15 17 15 1",
+" c None",
+"Y c Gray0",
+". c #080c08",
+"X c #181c18",
+"o c #282c28",
+"O c #484c48",
+"+ c #585c58",
+"@ c #0000f8",
+"# c #383cf8",
+"$ c #787cb8",
+"% c #787cf8",
+"& c #888c88",
+"* c #989c98",
+"= c #a8aca8",
+"- c #b8bcb8",
+/* pixels */
+" Y ",
+" Y.Y ",
+" Y. .Y ",
+" Y+ +Y ",
+" Y. .Y ",
+" Yo oY ",
+" Y. .Y ",
+" + + ",
+" ",
+" -# ",
+" #$#%% ",
+" $#@#- ",
+" #@@@% ",
+" %-#-$ ",
+" -% ",
+" ",
+" "
+};
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbar.xpm b/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbar.xpm
new file mode 100644
index 0000000000..3fc9bf9978
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbar.xpm
@@ -0,0 +1,38 @@
+/* XPM */
+static char *a_underline[] = {
+/* columns rows colors chars-per-pixel */
+"15 17 15 1",
+" c None",
+"Y c Gray0",
+". c #080c08",
+"X c #181c18",
+"o c #282c28",
+"O c #484c48",
+"+ c #585c58",
+"@ c #0000f8",
+"# c #383cf8",
+"$ c #787cb8",
+"% c #787cf8",
+"& c #888c88",
+"* c #989c98",
+"= c #a8aca8",
+"- c #b8bcb8",
+/* pixels */
+" ",
+" -# ",
+" #$#%% ",
+" $#@#- ",
+" #@@@% ",
+" %-#-$ ",
+" -% ",
+" ",
+" ",
+" ",
+" ",
+" +YYYYYYYYYYY+ ",
+" -===========o ",
+" ",
+" ",
+" ",
+" "
+};
\ No newline at end of file
diff --git a/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbrace.xpm b/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbrace.xpm
new file mode 100644
index 0000000000..c9ee0f9c7c
--- /dev/null
+++ b/TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbrace.xpm
@@ -0,0 +1,38 @@
+/* XPM */
+static char *a_underbrace_sharp[] = {
+/* columns rows colors chars-per-pixel */
+"15 17 15 1",
+" c None",
+"Y c Gray0",
+". c #080c08",
+"X c #181c18",
+"o c #282c28",
+"O c #484c48",
+"+ c #585c58",
+"@ c #0000f8",
+"# c #383cf8",
+"$ c #787cb8",
+"% c #787cf8",
+"& c #888c88",
+"* c #989c98",
+"= c #a8aca8",
+"- c #b8bcb8",
+/* pixels */
+" ",
+" -# ",
+" #$#%% ",
+" $#@#- ",
+" #@@@% ",
+" %-#-$ ",
+" -% ",
+" ",
+" + + ",
+" Y. .Y ",
+" Yo oY ",
+" Y. .Y ",
+" Y+ +Y ",
+" Y. .Y ",
+" Y.Y ",
+" Y ",
+" "
+};
\ No newline at end of file
diff --git a/TeXmacs/progs/math/math-menu.scm b/TeXmacs/progs/math/math-menu.scm
index ad045712ad..1fc6aef3d3 100644
--- a/TeXmacs/progs/math/math-menu.scm
+++ b/TeXmacs/progs/math/math-menu.scm
@@ -1257,7 +1257,11 @@
((balloon (icon "tm_dot.xpm") "keyboard equivalent:") (make-wide ""))
((balloon (icon "tm_ddot.xpm") "keyboard equivalent:") (make-wide ""))
((balloon (icon "tm_acute.xpm") "keyboard equivalent:") (make-wide ""))
- ((balloon (icon "tm_grave.xpm") "keyboard equivalent:") (make-wide ""))))
+ ((balloon (icon "tm_grave.xpm") "keyboard equivalent:") (make-wide ""))
+ ((balloon (icon "tm_overbrace.xpm") "keyboard equivalent:") (make-wide ""))
+ ((balloon (icon "tm_underbrace.xpm") "keyboard equivalent:") (make-wide-under ""))
+ ((balloon (icon "tm_underbar.xpm") "keyboard equivalent:") (make-wide-under ""))))
+
/
(=> (balloon (icon "tm_binop.xpm") "Insert a binary operation")
(tile 8 (link binary-operation-menu)))
diff --git a/devel/222_52.md b/devel/222_52.md
new file mode 100644
index 0000000000..a1709b2656
--- /dev/null
+++ b/devel/222_52.md
@@ -0,0 +1,50 @@
+# [222_52] Add overbrace/underbrace/underline entries to math accent toolbar
+
+### What
+Added three missing entries to the math mode accent dropdown (`tm_wide`) in the
+mode toolbar:
+- `\overbrace`
+- `\underbrace`
+- `\underline`
+
+Also added dedicated icon assets for these entries in both modern (`.xpm`) and
+liii (`.svg`) focus icon sets.
+
+### Why
+The accent toolbar had no direct options for overbrace, underbrace, or
+underline, even though these constructs are supported by math insertion and
+keyboard bindings. This made them harder to discover and inconsistent with other
+accent operations.
+
+### How
+In `TeXmacs/progs/math/math-menu.scm`:
+1. Extended the `tm_wide` accent tile (`math-insert-icons`) with 3 new buttons.
+2. Wired actions to existing math constructors:
+ - `make-wide ""`
+ - `make-wide-under ""`
+ - `make-wide-under ""`
+3. Kept tooltip style consistent with surrounding accent buttons
+ (`"keyboard equivalent:"`).
+
+Added icon assets:
+- `TeXmacs/misc/pixmaps/modern/16x16/focus/tm_overbrace.xpm`
+- `TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbrace.xpm`
+- `TeXmacs/misc/pixmaps/modern/16x16/focus/tm_underbar.xpm`
+- `TeXmacs/misc/pixmaps/liii/16x16/focus/tm_overbrace.svg`
+- `TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbrace.svg`
+- `TeXmacs/misc/pixmaps/liii/16x16/focus/tm_underbar.svg`
+
+## How to test
+1. Open Mogan Editor.
+2. Enter math mode (`$`).
+3. Open the accent dropdown from the `tm_wide` icon.
+4. Verify new entries are present with dedicated icons:
+ - overbrace
+ - underbrace
+ - underline (underbar)
+5. Click each entry and verify insertion result:
+ - overbrace inserts a wide overbrace construct
+ - underbrace inserts a wide underbrace construct
+ - underline inserts wide underbar (`\underline` behavior)
+6. Hover the new entries and verify tooltip formatting matches other accent
+ items.
\ No newline at end of file