diff --git a/readme.md b/readme.md
index 2e7e3b2..b05caa9 100644
--- a/readme.md
+++ b/readme.md
@@ -4118,10 +4118,10 @@ Global constants, functions and modules. This file is used directly or indirectl
 | ```circle4n(r, d = undef)``` | Circle with multiple of 4 vertices |
 | ```ellipse(xr, yr)``` | Draw an ellipse |
 | ```extrude_if(h, center = true)``` | Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D |
-| ```hflip()``` | Invert children by doing a 180 glip around the Y axis |
+| ```hflip()``` | Invert children by doing a 180° flip around the Y axis |
 | ```semi_circle(r, d = undef)``` | A semi circle in the positive Y domain |
 | ```translate_z(z)``` | Shortcut for Z only translations |
-| ```vflip()``` | Invert children by doing a 180 flip around the X axis |
+| ```vflip()``` | Invert children by doing a 180° flip around the X axis |
 
 ![global](tests/png/global.png)
 
diff --git a/utils/core/global.scad b/utils/core/global.scad
index b601cad..2783c0c 100644
--- a/utils/core/global.scad
+++ b/utils/core/global.scad
@@ -31,8 +31,8 @@ function r2sides(r) = $fn ? $fn : ceil(max(min(360/ $fa, r * 2 * PI / $fs), 5));
 function r2sides4n(r) = floor((r2sides(r) + 3) / 4) * 4;                            //! Round up the number of sides to a multiple of 4 to ensure points land on all axes
 
 module translate_z(z) translate([0, 0, z]) children();                              //! Shortcut for Z only translations
-module vflip() rotate([180, 0, 0]) children();                                      //! Invert children by doing a 180 flip around the X axis
-module hflip() rotate([0, 180, 0]) children();                                      //! Invert children by doing a 180 flip around the Y axis
+module vflip() rotate([180, 0, 0]) children();                                      //! Invert children by doing a 180° flip around the X axis
+module hflip() rotate([0, 180, 0]) children();                                      //! Invert children by doing a 180° flip around the Y axis
 module ellipse(xr, yr) scale([1, yr / xr]) circle4n(xr);                            //! Draw an ellipse
 
 module extrude_if(h, center = true)                 //! Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D