diff --git a/lisp/international/iso-transl.el b/lisp/international/iso-transl.el
index bdfe9b1670f..3be80e5e6ab 100644
--- a/lisp/international/iso-transl.el
+++ b/lisp/international/iso-transl.el
@@ -163,9 +163,30 @@
     ("S"    . [?§])
     ("*Y"   . [?¥])
     ("Y"    . [?¥])
+    ("^0"   . [?⁰])
     ("^1"   . [?¹])
     ("^2"   . [?²])
     ("^3"   . [?³])
+    ("^4"   . [?⁴])
+    ("^5"   . [?⁵])
+    ("^6"   . [?⁶])
+    ("^7"   . [?⁷])
+    ("^8"   . [?⁸])
+    ("^9"   . [?⁹])
+    ("^+"   . [?⁺])
+    ("^-"   . [?⁻])
+    ("_0"   . [?₀])
+    ("_1"   . [?₁])
+    ("_2"   . [?₂])
+    ("_3"   . [?₃])
+    ("_4"   . [?₄])
+    ("_5"   . [?₅])
+    ("_6"   . [?₆])
+    ("_7"   . [?₇])
+    ("_8"   . [?₈])
+    ("_9"   . [?₉])
+    ("_+"   . [?₊])
+    ("_-"   . [?₋])
     ("^A"   . [?Â])
     ("^E"   . [?Ê])
     ("^I"   . [?Î])