diff --git a/__DEFINES/math.dm b/__DEFINES/math.dm
index 6150765b59b..19dbcfa4a52 100644
--- a/__DEFINES/math.dm
+++ b/__DEFINES/math.dm
@@ -1,3 +1,8 @@
+#define PI 3.141592653
+
+// The TRUE circle constant!
+#define TAU (PI * 2)
+
 //"fancy" math for calculating time in ms from tick_usage percentage and the length of ticks
 //percent_of_tick_used * (ticklag * 100(to convert to ms)) / 100(percent ratio)
 //collapsed to percent_of_tick_used * tick_lag
diff --git a/__DEFINES/setup.dm b/__DEFINES/setup.dm
index e793d0ed87a..a220756da46 100644
--- a/__DEFINES/setup.dm
+++ b/__DEFINES/setup.dm
@@ -35,8 +35,6 @@ var/global/disable_vents     = 0
 #define PIPING_LAYER_P_Y		-5*PIXEL_MULTIPLIER //same, but negative because they form a diagonal
 #define PIPING_LAYER_LCHANGE	0.05 //how much the layer var changes per increment
 
-#define PI 3.1415
-
 #define R_IDEAL_GAS_EQUATION	8.314 //kPa*L/(K*mol)
 #define ONE_ATMOSPHERE		101.325	//kPa
 #define MARS_ATMOSPHERE		0.6 //kPa
diff --git a/code/modules/scripting/Implementations/Telecomms.dm b/code/modules/scripting/Implementations/Telecomms.dm
index c7ba4e75291..788cdc1fdc2 100644
--- a/code/modules/scripting/Implementations/Telecomms.dm
+++ b/code/modules/scripting/Implementations/Telecomms.dm
@@ -61,9 +61,10 @@
 
 	interpreter.container = src
 
-	interpreter.SetVar("PI",	 	3.141592653)	// value of pi
-	interpreter.SetVar("E",		 	2.718281828)	// value of e
-	interpreter.SetVar("SQURT2", 	1.414213562)	// value of the square root of 2
+	interpreter.SetVar("TAU",	 	TAU)			// value of tau
+	interpreter.SetVar("PI",	 	PI)				// value of pi
+	interpreter.SetVar("E",		 	E)				// value of e
+	interpreter.SetVar("SQURT2", 	Sqrt2)			// value of the square root of 2
 	interpreter.SetVar("FALSE", 	0)				// boolean shortcut to 0
 	interpreter.SetVar("false", 	0)				// boolean shortcut to 0
 	interpreter.SetVar("TRUE",		1)				// boolean shortcut to 1