diff --git a/apps/sequence/sequence.cpp b/apps/sequence/sequence.cpp
index b9f77327a..3f0a86a29 100644
--- a/apps/sequence/sequence.cpp
+++ b/apps/sequence/sequence.cpp
@@ -126,7 +126,7 @@ T Sequence::approximateToNextRank(int n, SequenceContext * sqctx) const {
 
   constexpr int bufferSize = CodePoint::MaxCodePointCharLength + 1;
   char unknownN[bufferSize];
-  Poincare::SerializationHelper::CodePoint(unknownN, bufferSize, UCodePointUnknownN);
+  Poincare::SerializationHelper::CodePoint(unknownN, bufferSize, UCodePointUnknownX);
 
   CacheContext<T> ctx = CacheContext<T>(sqctx);
   // Hold values u(n), u(n-1), u(n-2), v(n), v(n-1), v(n-2)...
diff --git a/apps/sequence/sequence.h b/apps/sequence/sequence.h
index 7a904dd9a..db28a2db6 100644
--- a/apps/sequence/sequence.h
+++ b/apps/sequence/sequence.h
@@ -27,7 +27,7 @@ public:
     Function(record),
     m_nameLayout() {}
   CodePoint symbol() const override { return 'n'; }
-  CodePoint unknownSymbol() const override { return UCodePointUnknownN; }
+  CodePoint unknownSymbol() const override { return UCodePointUnknownX; }
   void tidy() override;
   // MetaData getters
   Type type() const;
diff --git a/ion/include/ion/unicode/code_point.h b/ion/include/ion/unicode/code_point.h
index a736160d0..b60b800e8 100644
--- a/ion/include/ion/unicode/code_point.h
+++ b/ion/include/ion/unicode/code_point.h
@@ -21,7 +21,6 @@ static constexpr CodePoint UCodePointNull                     = 0x0;
 /* 0x1 and 0x2 represent soh and stx. They are not used, so we can use them for
  * another purpose */
 static constexpr CodePoint UCodePointUnknownX                 = 0x1;
-static constexpr CodePoint UCodePointUnknownN                 = 0x2;
 
 static constexpr CodePoint UCodePointTabulation               = 0x9;
 static constexpr CodePoint UCodePointLineFeed                 = 0xa;
diff --git a/poincare/include/poincare/symbol.h b/poincare/include/poincare/symbol.h
index 0678ec726..5d6e5e290 100644
--- a/poincare/include/poincare/symbol.h
+++ b/poincare/include/poincare/symbol.h
@@ -62,7 +62,7 @@ public:
   static Symbol Ans() { return Symbol::Builder(k_ans, k_ansLength); }
 
   // Symbol properties
-  bool isSystemSymbol() const { return node()->isUnknown(UCodePointUnknownX) || node()->isUnknown(UCodePointUnknownN); }
+  bool isSystemSymbol() const { return node()->isUnknown(UCodePointUnknownX); }
   const char * name() const { return node()->name(); }
   static bool isSeriesSymbol(const char * c);
   static bool isRegressionSymbol(const char * c);
diff --git a/poincare/src/symbol.cpp b/poincare/src/symbol.cpp
index 020c7e108..4f3e18856 100644
--- a/poincare/src/symbol.cpp
+++ b/poincare/src/symbol.cpp
@@ -75,7 +75,7 @@ float SymbolNode::characteristicXRange(Context * context, Preferences::AngleUnit
 }
 
 Layout SymbolNode::createLayout(Preferences::PrintFloatMode floatDisplayMode, int numberOfSignificantDigits) const {
-  assert(!isUnknown(UCodePointUnknownX) && !isUnknown(UCodePointUnknownN));
+  assert(!isUnknown(UCodePointUnknownX));
   // TODO return Parse(m_name).createLayout() ?
   // Special case for the symbol names: u(n), u(n+1), v(n), v(n+1), w(n), w(n+1)
   const char * sequenceIndex[] = {"n", "n+1"};