diff --git a/CHANGELOG.md b/CHANGELOG.md
index 30edfec..9f05e18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@
 ### New in `sym`
 
 - Mathematical symbols
+  - `gt.double.nested`: ⪢
+  - `lt.double.nested`: ⪡
+  - `gt.arc` ⪧
+  - `gt.arc.eq` ⪩
+  - `lt.arc`: ⪦
+  - `lt.arc.eq`: ⪨
   - `subset.approx`: ⫉
   - `subset.closed`: ⫏
   - `subset.closed.eq`: ⫑
diff --git a/src/modules/sym.txt b/src/modules/sym.txt
index 7004f86..eb79e8a 100644
--- a/src/modules/sym.txt
+++ b/src/modules/sym.txt
@@ -306,7 +306,10 @@ gt >
   .o ⧁
   .dot ⋗
   .approx ⪆
+  .arc ⪧
+  .arc.eq ⪩
   .double ≫
+  .double.nested ⪢
   .eq ≥
   .eq.slant ⩾
   .eq.lt ⋛
@@ -331,7 +334,10 @@ lt <
   .o ⧀
   .dot ⋖
   .approx ⪅
+  .arc ⪦
+  .arc.eq ⪨
   .double ≪
+  .double.nested ⪡
   .eq ≤
   .eq.slant ⩽
   .eq.gt ⋚