diff --git a/src/main/java/org/warp/picalculator/Utils.java b/src/main/java/org/warp/picalculator/Utils.java
index f2c79f5c..5b896acc 100755
--- a/src/main/java/org/warp/picalculator/Utils.java
+++ b/src/main/java/org/warp/picalculator/Utils.java
@@ -107,6 +107,7 @@ public class Utils {
 					.replace(""+MathematicalSymbols.ARC_TANGENT, "atan")
 					.replace(""+MathematicalSymbols.UNDEFINED, "undefined")
 					.replace(""+MathematicalSymbols.PI, "PI")
+					.replace(""+MathematicalSymbols.EULER_NUMBER, "EULER_NUMBER")
 					.replace(""+MathematicalSymbols.X, "X")
 					.replace(""+MathematicalSymbols.Y, "Y")
 					;
diff --git a/src/main/java/org/warp/picalculator/device/Key.java b/src/main/java/org/warp/picalculator/device/Key.java
index 1aa44821..ec390010 100644
--- a/src/main/java/org/warp/picalculator/device/Key.java
+++ b/src/main/java/org/warp/picalculator/device/Key.java
@@ -8,5 +8,5 @@ public enum Key {
 	PLUS, MINUS, PLUS_MINUS, MULTIPLY, DIVIDE, EQUAL, DELETE, RESET, LEFT, RIGHT,
 	UP, DOWN, OK, debug1, debug2, debug3, debug4, debug5, SQRT, ROOT, POWER_OF_2,
 	POWER_OF_x, SINE, COSINE, TANGENT, ARCSINE, ARCCOSINE, ARCTANGENT, PI, SETTINGS,
-	F1, F2, F3, F4, BACK, ZOOM_MODE, LOGARITHM
+	F1, F2, F3, F4, BACK, ZOOM_MODE, LOGARITHM, EULER_NUMBER
 }
\ No newline at end of file
diff --git a/src/main/java/org/warp/picalculator/device/Keyboard.java b/src/main/java/org/warp/picalculator/device/Keyboard.java
index 7bf4db62..09c23a16 100755
--- a/src/main/java/org/warp/picalculator/device/Keyboard.java
+++ b/src/main/java/org/warp/picalculator/device/Keyboard.java
@@ -170,6 +170,15 @@ public class Keyboard {
 					Keyboard.keyPressed(Key.NONE);
 				}
 				break;
+			case KeyEvent.VK_E:
+				if (Keyboard.shift) {
+					Keyboard.keyPressed(Key.NONE);
+				} else if (Keyboard.alpha) {
+					Keyboard.keyPressed(Key.NONE);
+				} else {
+					Keyboard.keyPressed(Key.EULER_NUMBER);
+				}
+				break;
 			case KeyEvent.VK_Y:
 				if (Keyboard.alpha) {
 					Keyboard.keyPressed(Key.LETTER_Y);
diff --git a/src/main/java/org/warp/picalculator/gui/expression/InputContext.java b/src/main/java/org/warp/picalculator/gui/expression/InputContext.java
index b51256fc..38824ed2 100644
--- a/src/main/java/org/warp/picalculator/gui/expression/InputContext.java
+++ b/src/main/java/org/warp/picalculator/gui/expression/InputContext.java
@@ -13,6 +13,7 @@ public class InputContext {
 	public InputContext() {
 		this.variableTypes = new HashMap<>();
 		this.variableTypes.put(MathematicalSymbols.PI, V_TYPE.CONSTANT);
+		this.variableTypes.put(MathematicalSymbols.EULER_NUMBER, V_TYPE.CONSTANT);
 	}
 
 	public InputContext(HashMap<Character, V_TYPE> variableTypes) {
diff --git a/src/main/java/org/warp/picalculator/gui/expression/containers/NormalInputContainer.java b/src/main/java/org/warp/picalculator/gui/expression/containers/NormalInputContainer.java
index bb200d5d..c6dd59b0 100755
--- a/src/main/java/org/warp/picalculator/gui/expression/containers/NormalInputContainer.java
+++ b/src/main/java/org/warp/picalculator/gui/expression/containers/NormalInputContainer.java
@@ -76,6 +76,8 @@ public class NormalInputContainer extends InputContainer {
 				return new BlockLogarithm();
 			case MathematicalSymbols.PI:
 				return new BlockVariable(inputContext, c, true);
+			case MathematicalSymbols.EULER_NUMBER:
+				return new BlockVariable(inputContext, c, true);
 			default:
 				for (char v : MathematicalSymbols.variables) {
 					if (c == v) {
diff --git a/src/main/java/org/warp/picalculator/gui/graphicengine/cpu/CPUFont.java b/src/main/java/org/warp/picalculator/gui/graphicengine/cpu/CPUFont.java
index 3b8fe502..5d124a9f 100755
--- a/src/main/java/org/warp/picalculator/gui/graphicengine/cpu/CPUFont.java
+++ b/src/main/java/org/warp/picalculator/gui/graphicengine/cpu/CPUFont.java
@@ -110,7 +110,7 @@ public class CPUFont implements BinaryFont {
 				minBound = file[0x9] << 24 | file[0xA] << 16 | file[0xB] << 8 | file[0xC];
 				maxBound = file[0xE] << 24 | file[0xF] << 16 | file[0x10] << 8 | file[0x11];
 				if (maxBound <= minBound) {
-					maxBound = 9900; //TODO remove it: temp fix
+					maxBound = 66000; //TODO remove it: temp fix
 				}
 				rawchars = new boolean[maxBound - minBound][];
 				int index = 0x12;
diff --git a/src/main/java/org/warp/picalculator/gui/screens/MathInputScreen.java b/src/main/java/org/warp/picalculator/gui/screens/MathInputScreen.java
index 5cbe6e29..3d9f5d57 100755
--- a/src/main/java/org/warp/picalculator/gui/screens/MathInputScreen.java
+++ b/src/main/java/org/warp/picalculator/gui/screens/MathInputScreen.java
@@ -337,6 +337,9 @@ public class MathInputScreen extends Screen {
 							case PI:
 								typeChar(MathematicalSymbols.PI);
 								return true;
+							case EULER_NUMBER:
+								typeChar(MathematicalSymbols.EULER_NUMBER);
+								return true;
 							case LETTER_X:
 								typeChar(MathematicalSymbols.variables[23]);
 								return true;
diff --git a/src/main/java/org/warp/picalculator/math/MathematicalSymbols.java b/src/main/java/org/warp/picalculator/math/MathematicalSymbols.java
index a1e9136d..11805572 100755
--- a/src/main/java/org/warp/picalculator/math/MathematicalSymbols.java
+++ b/src/main/java/org/warp/picalculator/math/MathematicalSymbols.java
@@ -28,6 +28,7 @@ public class MathematicalSymbols {
 	public static final char LOGARITHM = 'Ⓙ';
 	public static final char UNDEFINED = '∅';
 	public static final char PI = 'π';
+	public static final char EULER_NUMBER = 'ｅ';
 	public static final char X = 'ⓧ';
 	public static final char Y = 'Ⓨ';
 
@@ -52,7 +53,7 @@ public class MathematicalSymbols {
 
 	public static final char[] parentheses = new char[] { PARENTHESIS_OPEN, PARENTHESIS_CLOSE };
 
-	public static final char[] variables = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', X, Y, 'Z', PI, UNDEFINED };
+	public static final char[] variables = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', X, Y, 'Z', PI, EULER_NUMBER, UNDEFINED };
 
 	public static final char[] genericSyntax = new char[] { SYSTEM, EQUATION };
 
diff --git a/src/main/resources/font_norm.rft b/src/main/resources/font_norm.rft
index cad2657c..d4e5e1e7 100644
Binary files a/src/main/resources/font_norm.rft and b/src/main/resources/font_norm.rft differ
diff --git a/src/main/resources/font_smal.rft b/src/main/resources/font_smal.rft
index a61b6966..bd07662e 100644
Binary files a/src/main/resources/font_smal.rft and b/src/main/resources/font_smal.rft differ