diff --git a/char-def.lua b/char-def.lua
index c496b4a..515f932 100644
--- a/char-def.lua
+++ b/char-def.lua
@@ -63379,6 +63379,46 @@ characters.data={
   mirror=0x27EA,
   unicodeslot=0x27EB,
  },
+ [0x27EC]={
+  category="ps",
+  cjkwd="na",
+  description="MATHEMATICAL LEFT WHITE TORTOISE SHELL BRACKET",
+  direction="on",
+  linebreak="op",
+  mirror=0x27ED,
+  unicodeslot=0x27EC,
+ },
+ [0x27ED]={
+  category="pe",
+  cjkwd="na",
+  description="MATHEMATICAL RIGHT WHITE TORTOISE SHELL BRACKET",
+  direction="on",
+  linebreak="cl",
+  mirror=0x27EC,
+  unicodeslot=0x27ED,
+ },
+ [0x27EE]={
+  category="ps",
+  cjkwd="na",
+  description="MATHEMATICAL LEFT FLATTENED PARENTHESIS",
+  direction="on",
+  linebreak="op",
+  mathclass="open",
+  mathname="lgroup",
+  mirror=0x27EF,
+  unicodeslot=0x27EE,
+ },
+ [0x27EF]={
+  category="pe",
+  cjkwd="na",
+  description="MATHEMATICAL RIGHT FLATTENED PARENTHESIS",
+  direction="on",
+  linebreak="cl",
+  mathclass="close",
+  mathname="rgroup",
+  mirror=0x27EE,
+  unicodeslot=0x27EF,
+ },
  [0x27F0]={
   category="sm",
   description="UPWARDS QUADRUPLE ARROW",
@@ -75694,8 +75734,6 @@ characters.data={
   direction="on",
   linebreak="op",
   mirror=0x3015,
-  mathclass="open",
-  mathname="lgroup",
   unicodeslot=0x3014,
  },
  [0x3015]={
@@ -75705,8 +75743,6 @@ characters.data={
   direction="on",
   linebreak="cl",
   mirror=0x3014,
-  mathclass="close",
-  mathname="rgroup",
   unicodeslot=0x3015,
  },
  [0x3016]={