diff --git a/library/core/src/num/f128.rs b/library/core/src/num/f128.rs
index 2cf06b6d6a35a..1009683fe93d3 100644
--- a/library/core/src/num/f128.rs
+++ b/library/core/src/num/f128.rs
@@ -34,13 +34,13 @@ pub mod consts {
 
     /// The golden ratio (φ)
     #[unstable(feature = "f128", issue = "116909")]
-    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const PHI: f128 = 1.61803398874989484820458683436563811772030917980576286213545_f128;
+    pub const GOLDEN_RATIO: f128 =
+        1.61803398874989484820458683436563811772030917980576286213545_f128;
 
     /// The Euler-Mascheroni constant (γ)
     #[unstable(feature = "f128", issue = "116909")]
-    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const EGAMMA: f128 = 0.577215664901532860606512090082402431042159335939923598805767_f128;
+    pub const EULER_GAMMA: f128 =
+        0.577215664901532860606512090082402431042159335939923598805767_f128;
 
     /// π/2
     #[unstable(feature = "f128", issue = "116909")]
@@ -108,6 +108,17 @@ pub mod consts {
     pub const FRAC_1_SQRT_3: f128 =
         0.577350269189625764509148780501957455647601751270126876018602_f128;
 
+    /// sqrt(5)
+    #[unstable(feature = "f128", issue = "116909")]
+    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const SQRT_5: f128 = 2.23606797749978969640917366873127623544061835961152572427089_f128;
+
+    /// 1/sqrt(5)
+    #[unstable(feature = "f128", issue = "116909")]
+    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const FRAC_1_SQRT_5: f128 =
+        0.447213595499957939281834733746255247088123671922305144854179_f128;
+
     /// Euler's number (e)
     #[unstable(feature = "f128", issue = "116909")]
     pub const E: f128 = 2.71828182845904523536028747135266249775724709369995957496697_f128;
diff --git a/library/core/src/num/f16.rs b/library/core/src/num/f16.rs
index 51f803672e5c6..007828acd6426 100644
--- a/library/core/src/num/f16.rs
+++ b/library/core/src/num/f16.rs
@@ -36,13 +36,11 @@ pub mod consts {
 
     /// The golden ratio (φ)
     #[unstable(feature = "f16", issue = "116909")]
-    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const PHI: f16 = 1.618033988749894848204586834365638118_f16;
+    pub const GOLDEN_RATIO: f16 = 1.618033988749894848204586834365638118_f16;
 
     /// The Euler-Mascheroni constant (γ)
     #[unstable(feature = "f16", issue = "116909")]
-    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const EGAMMA: f16 = 0.577215664901532860606512090082402431_f16;
+    pub const EULER_GAMMA: f16 = 0.577215664901532860606512090082402431_f16;
 
     /// π/2
     #[unstable(feature = "f16", issue = "116909")]
@@ -105,6 +103,16 @@ pub mod consts {
     // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
     pub const FRAC_1_SQRT_3: f16 = 0.577350269189625764509148780501957456_f16;
 
+    /// sqrt(5)
+    #[unstable(feature = "f16", issue = "116909")]
+    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const SQRT_5: f16 = 2.236067977499789696409173668731276235_f16;
+
+    /// 1/sqrt(5)
+    #[unstable(feature = "f16", issue = "116909")]
+    // Also, #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const FRAC_1_SQRT_5: f16 = 0.447213595499957939281834733746255247_f16;
+
     /// Euler's number (e)
     #[unstable(feature = "f16", issue = "116909")]
     pub const E: f16 = 2.71828182845904523536028747135266250_f16;
diff --git a/library/core/src/num/f32.rs b/library/core/src/num/f32.rs
index 3070e1dedbe43..96d172e66c288 100644
--- a/library/core/src/num/f32.rs
+++ b/library/core/src/num/f32.rs
@@ -293,11 +293,11 @@ pub mod consts {
 
     /// The golden ratio (φ)
     #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const PHI: f32 = 1.618033988749894848204586834365638118_f32;
+    pub const GOLDEN_RATIO: f32 = 1.618033988749894848204586834365638118_f32;
 
     /// The Euler-Mascheroni constant (γ)
     #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const EGAMMA: f32 = 0.577215664901532860606512090082402431_f32;
+    pub const EULER_GAMMA: f32 = 0.577215664901532860606512090082402431_f32;
 
     /// π/2
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -356,6 +356,14 @@ pub mod consts {
     #[unstable(feature = "more_float_constants", issue = "146939")]
     pub const FRAC_1_SQRT_3: f32 = 0.577350269189625764509148780501957456_f32;
 
+    /// sqrt(5)
+    #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const SQRT_5: f32 = 2.236067977499789696409173668731276235_f32;
+
+    /// 1/sqrt(5)
+    #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const FRAC_1_SQRT_5: f32 = 0.447213595499957939281834733746255247_f32;
+
     /// Euler's number (e)
     #[stable(feature = "rust1", since = "1.0.0")]
     pub const E: f32 = 2.71828182845904523536028747135266250_f32;
diff --git a/library/core/src/num/f64.rs b/library/core/src/num/f64.rs
index dc8ccc551b2da..26b19346cd401 100644
--- a/library/core/src/num/f64.rs
+++ b/library/core/src/num/f64.rs
@@ -293,11 +293,11 @@ pub mod consts {
 
     /// The golden ratio (φ)
     #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const PHI: f64 = 1.618033988749894848204586834365638118_f64;
+    pub const GOLDEN_RATIO: f64 = 1.618033988749894848204586834365638118_f64;
 
     /// The Euler-Mascheroni constant (γ)
     #[unstable(feature = "more_float_constants", issue = "146939")]
-    pub const EGAMMA: f64 = 0.577215664901532860606512090082402431_f64;
+    pub const EULER_GAMMA: f64 = 0.577215664901532860606512090082402431_f64;
 
     /// π/2
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -356,6 +356,14 @@ pub mod consts {
     #[unstable(feature = "more_float_constants", issue = "146939")]
     pub const FRAC_1_SQRT_3: f64 = 0.577350269189625764509148780501957456_f64;
 
+    /// sqrt(5)
+    #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const SQRT_5: f64 = 2.236067977499789696409173668731276235_f64;
+
+    /// 1/sqrt(5)
+    #[unstable(feature = "more_float_constants", issue = "146939")]
+    pub const FRAC_1_SQRT_5: f64 = 0.447213595499957939281834733746255247_f64;
+
     /// Euler's number (e)
     #[stable(feature = "rust1", since = "1.0.0")]
     pub const E: f64 = 2.71828182845904523536028747135266250_f64;