diff --git a/src/nodes/parse.rs b/src/nodes/parse.rs
index ec44b3f..f4375f5 100644
--- a/src/nodes/parse.rs
+++ b/src/nodes/parse.rs
@@ -10,7 +10,7 @@ impl Node {
         Ok(match s {
             "c" => Self::from(299_792_458),
             "A" => Self::from(6.02214076e23),
-            "pi" => Self::from(f64::consts::PI),
+            "pi" | "π" => Self::from(f64::consts::PI),
             // Planck's constant, in J*s (joule-seconds)
             "h" => Self::from(6.62607015e-34),
             "e" => Self::from(f64::consts::E),