diff --git a/README.md b/README.md
index eb61fef..d412394 100644
--- a/README.md
+++ b/README.md
@@ -2394,7 +2394,8 @@ now — they are listed so they are not mistaken for anything else:
   section was short of room, and finding one meant scrolling past the others. The built
   sidebar is a **Measure** tab (the cursors readout and the measurements) and a **Signals**
   tab (the trigger and the channels), **each a pill with its own glyph and no text** — the
-  cursors and the ruler for Measure, the trigger and the channel list for Signals, drawn as a
+  cursors and the ruler for Measure, a sine crossing its trigger level and the channel list for
+  Signals (the same picture the toolbar's trigger button carries), drawn as a
   32x16 pair so both motifs are legible at a glance — with the words kept as each pill's tooltip and
   accessible name. The design spec had the switcher showing *titles* and neither page an
   `icon-name`; `narrow` alone does not do it (libadwaita still draws a label beside the icon,
diff --git a/docs/claude/invariants-gtk-and-chrome.md b/docs/claude/invariants-gtk-and-chrome.md
index 7ee0120..598b833 100644
--- a/docs/claude/invariants-gtk-and-chrome.md
+++ b/docs/claude/invariants-gtk-and-chrome.md
@@ -66,7 +66,12 @@ Part of [CLAUDE.md](../../CLAUDE.md). These are rules that cost a defect to lear
   `udpscope-tab-signals-symbolic` is the trigger's edge above the channel list it acts on. They are not
   reuses because a glyph the toolbar already carries means two things the moment a tab shows it too. Both
   are **32x16** composites, one motif per half: the Measure pill is the two cursors beside the ruler, the
-  Signals pill the trigger beside the channel list. Wider than tall on purpose — a 16px square cell carries
+  Signals pill a sine with a dashed level through it beside the channel list. That picture is shared on
+  purpose: the trigger's *own* toolbar icon (`udpscope-trigger-symbolic`) is the same sine and the same
+  level, one period of one-pixel stairs, so the pill and the button that turns the trigger on are
+  recognisably about the same thing. The trigger glyph used to be a rising edge, and one edge names only
+  one of the four shape triggers the panel offers — a wave crossing a level names the trigger's job.
+  Wider than tall on purpose — a 16px square cell carries
   one motif, and squeezing a pair into it is what turns both into a smear — and the pill has the width for
   it, in a 300px column whose switcher has two pills in it. **GDK paints an icon into a square box whatever
   the document's aspect** (measured: `gtk_icon_theme_lookup_icon()` at 32 reports `32x32`, and librsvg
diff --git a/docs/claude/verification.md b/docs/claude/verification.md
index 3fbbea0..ac9b0ca 100644
--- a/docs/claude/verification.md
+++ b/docs/claude/verification.md
@@ -16,7 +16,7 @@ xvfb-run -a env UDPSCOPE_EXIT_AFTER_MS=8000 UDPSCOPE_ENABLE_ALL_MS=1000 \
 Two baselines every run is read against. A clean build emits **four** warnings and no more: two
 `-Wmissing-field-initializers` on `MathNode::source` and `-Woverlength-strings` on **both**
 generated GResource `.c` files — the help pages' (**514660** bytes) and the icons', whose blob is
-**11661** against C99's 4095-byte string-literal limit with the seven action icons and the two app icons
+**12408** against C99's 4095-byte string-literal limit with the seven action icons and the two app icons
 that remain (a note about a generated file, which GCC itself supports) -- re-measured when
 the tab work changed the set (that icon left, the two tab glyphs arrived, and this file's
 help page was rewritten), which did not move the count; re-measure by touching each `*.gresource.xml`
diff --git a/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg b/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg
index 01bbf85..2301750 100644
--- a/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg
+++ b/src/icons/scalable/actions/udpscope-tab-measure-symbolic.svg
@@ -1,26 +1,24 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- SPDX-License-Identifier: MIT -->
 <!-- SPDX-FileCopyrightText: 2026 Martino Ferrari -->
-<!-- The Measure tab, as two motifs side by side in a 32x16 cell: the two cursors on the left (a cap
-     over a dashed shaft, the shape the toolbar's cursors button has) and the ruler they read against
-     on the right. The ruler is a closed frame with its ticks hanging inside it, which needs
-     `fill-rule="evenodd"`: the ticks sit inside the frame's hole, three crossings deep, so they fill
-     rather than punching a second hole. The cursors do not overlap the ruler, so one evenodd path
-     carries both without either cancelling. Rendered at 32, i.e. 1:1, so the 2px bars stay crisp,
-     and every coordinate is a whole pixel of the cell. As with the Signals glyph, GDK's box is
-     square whatever the document's aspect: this pair is letterboxed, not stretched. -->
+<!-- The Measure tab: the cursors and the ruler they read against. The caps and the dashed shafts
+     are the toolbar's cursors at the same 2px weight; the ruler's ticks hang inside its frame, which
+     needs `fill-rule="evenodd"` — a tick inside the frame's hole is three crossings deep, so it fills
+     rather than punching a second hole. Both halves are inset two pixels and centred on the same
+     line, so the pair reads as one instrument rather than as two icons that share a box. -->
 <svg height="16px" width="32px" viewBox="0 0 32 16" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#2e3436" fill-rule="evenodd" d="M1 1 H7 V4 H1 Z
-                          M3 5 H6 V8 H3 Z
-                          M3 9 H6 V12 H3 Z
-                          M3 13 H6 V16 H3 Z
-                          M9 1 H15 V4 H9 Z
-                          M11 5 H14 V8 H11 Z
-                          M11 9 H14 V12 H11 Z
-                          M11 13 H14 V16 H11 Z
-                          M17 4 H31 V12 H17 Z
-                          M19 6 H29 V10 H19 Z
-                          M21 6 H22 V9 H21 Z
-                          M25 6 H26 V9 H25 Z
-                          M28 6 H29 V8 H28 Z"/>
+  <path fill="#2e3436"
+        fill-rule="evenodd" d="M2 2 H7 V4 H2 Z
+                          M10 2 H15 V4 H10 Z
+                          M3 5 H5 V7 H3 Z
+                          M3 9 H5 V11 H3 Z
+                          M3 13 H5 V15 H3 Z
+                          M10 5 H12 V7 H10 Z
+                          M10 9 H12 V11 H10 Z
+                          M10 13 H12 V15 H10 Z
+                          M17 5 H30 V12 H17 Z
+                          M19 7 H28 V10 H19 Z
+                          M20 7 H21 V9 H20 Z
+                          M23 7 H24 V9 H23 Z
+                          M26 7 H27 V9 H26 Z"/>
 </svg>
diff --git a/src/icons/scalable/actions/udpscope-tab-signals-symbolic.svg b/src/icons/scalable/actions/udpscope-tab-signals-symbolic.svg
index abc84ac..a052491 100644
--- a/src/icons/scalable/actions/udpscope-tab-signals-symbolic.svg
+++ b/src/icons/scalable/actions/udpscope-tab-signals-symbolic.svg
@@ -1,21 +1,28 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- SPDX-License-Identifier: MIT -->
 <!-- SPDX-FileCopyrightText: 2026 Martino Ferrari -->
-<!-- The Signals tab, as two motifs side by side in a 32x16 cell: the trigger on the left (a rising
-     edge crossing a dashed level, the shape the toolbar's trigger button has) and three rows of a
-     colour chip and a name on the right, which is the channel list the tab mostly is. Wider than
-     tall because it has to hold *two* motifs: a 16px square cell can carry one, and squeezing the
-     pair into it is what turns them into a smear. The pill renders this at 32, i.e. 1:1, so the 2px
-     bars stay crisp; a fractional scale would blur them, which is why every coordinate is a whole
-     pixel. GDK paints an icon into a *square* box whatever the document's aspect, so this pair is
-     letterboxed in a 32x32 box rather than stretched (measured: a 32x16 render inside a 32 request).
-     All subpaths are filled `path`s wound the same way. -->
+<!-- The Signals tab: the toolbar's trigger picture — a sine with a dashed level through it — beside
+     the channel list. Sharing that picture is the point: the pill and the toolbar button that turns
+     the trigger on should be recognisably about the same thing. Three channel rows on the right, on
+     the left half's centre line, and everything inset two pixels, because art flush with the cell
+     edge is what a button or a crop clips. -->
 <svg height="16px" width="32px" viewBox="0 0 32 16" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#2e3436" d="M4 2 H6 V12 H4 Z
-                          M6 2 H14 V4 H6 Z
-                          M0 7 H2 V9 H0 Z
-                          M8 7 H10 V9 H8 Z
-                          M12 7 H14 V9 H12 Z
+  <path fill="#2e3436" d="M2 6 H3 V10 H2 Z
+                          M3 4 H4 V8 H3 Z
+                          M4 3 H5 V7 H4 Z
+                          M5 2 H6 V6 H5 Z
+                          M6 3 H7 V7 H6 Z
+                          M7 4 H8 V8 H7 Z
+                          M8 6 H9 V10 H8 Z
+                          M9 8 H10 V12 H9 Z
+                          M10 9 H11 V13 H10 Z
+                          M11 10 H12 V14 H11 Z
+                          M12 9 H13 V13 H12 Z
+                          M13 8 H14 V12 H13 Z
+                          M14 6 H15 V10 H14 Z
+                          M2 7 H5 V9 H2 Z
+                          M7 7 H10 V9 H7 Z
+                          M12 7 H15 V9 H12 Z
                           M18 2 H21 V5 H18 Z
                           M23 3 H30 V5 H23 Z
                           M18 7 H21 V10 H18 Z
diff --git a/src/icons/scalable/actions/udpscope-trigger-symbolic.svg b/src/icons/scalable/actions/udpscope-trigger-symbolic.svg
index 8de4ebe..777e512 100644
--- a/src/icons/scalable/actions/udpscope-trigger-symbolic.svg
+++ b/src/icons/scalable/actions/udpscope-trigger-symbolic.svg
@@ -1,16 +1,26 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- SPDX-License-Identifier: MIT -->
 <!-- SPDX-FileCopyrightText: 2026 Martino Ferrari -->
-<!-- A rising edge crossing a dashed trigger level: what the trigger *is*. The dash
-     rhythm is 2 on, 1 off (tight enough to read as one line rather than as a row of
-     dots), with the one wide gap at x 5..9 that the edge rises through. Every
-     coordinate is a whole pixel of the 16px cell so nothing blurs at 1x. -->
+<!-- The trigger: a sine and the dashed level it is looked for at, which is what a trigger *is* on a
+     waveform that is not a step. It used to be a rising edge, and one edge names only one of the four
+     shape triggers the panel offers — a wave crossing a level names the trigger's job instead. One
+     period, one-pixel stairs, the way the plot rasterises its own traces, with the level through the
+     centre so the crest and the trough stand clear and the crossings fall on the steep parts. Inset
+     two pixels, like the tabs' glyphs, so no art is flush with an edge a button might clip. -->
 <svg height="16px" width="16px" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg">
-  <path fill="#2e3436" d="M0 11 H8 V13 H0 Z
-                          M6 3 H8 V13 H6 Z
-                          M6 3 H16 V5 H6 Z
-                          M0 7 H2 V9 H0 Z
-                          M3 7 H5 V9 H3 Z
-                          M9 7 H11 V9 H9 Z
-                          M12 7 H14 V9 H12 Z"/>
+  <path fill="#2e3436" d="M2 7 H3 V10 H2 Z
+                          M3 5 H4 V8 H3 Z
+                          M4 3 H5 V6 H4 Z
+                          M5 3 H6 V6 H5 Z
+                          M6 4 H7 V7 H6 Z
+                          M7 6 H8 V9 H7 Z
+                          M8 8 H9 V11 H8 Z
+                          M9 10 H10 V13 H9 Z
+                          M10 11 H11 V14 H10 Z
+                          M11 11 H12 V14 H11 Z
+                          M12 9 H13 V12 H12 Z
+                          M13 7 H14 V10 H13 Z
+                          M2 7 H5 V9 H2 Z
+                          M7 7 H10 V9 H7 Z
+                          M11 7 H14 V9 H11 Z"/>
 </svg>