diff --git a/charming/src/element/symbol.rs b/charming/src/element/symbol.rs
index ec37005..3aa219f 100644
--- a/charming/src/element/symbol.rs
+++ b/charming/src/element/symbol.rs
@@ -1,3 +1,4 @@
+use super::RawString;
 use serde::Serialize;
 
 #[derive(Debug, PartialEq, PartialOrd, Clone)]
@@ -11,6 +12,7 @@ pub enum Symbol {
     Arrow,
     None,
     Custom(String),
+    Callback(RawString),
 }
 
 impl Serialize for Symbol {
@@ -25,6 +27,7 @@ impl Serialize for Symbol {
             Symbol::Arrow => serializer.serialize_str("arrow"),
             Symbol::None => serializer.serialize_str("none"),
             Symbol::Custom(s) => serializer.serialize_str(s),
+            Symbol::Callback(s) => s.serialize(serializer),
         }
     }
 }
diff --git a/gallery/src/lib.rs b/gallery/src/lib.rs
index b05114a..76b4f78 100644
--- a/gallery/src/lib.rs
+++ b/gallery/src/lib.rs
@@ -110,6 +110,7 @@ lazy_static! {
         insert!(m, line, area_pieces);
         insert!(m, line, basic_area);
         insert!(m, line, basic_line);
+        insert!(m, line, different_symbols);
         insert!(m, line, confidence_band);
         insert!(m, line, data_transform_filter);
         insert!(m, line, distribution_of_electricity);
diff --git a/gallery/src/line/different_symbols.rs b/gallery/src/line/different_symbols.rs
new file mode 100644
index 0000000..435dc84
--- /dev/null
+++ b/gallery/src/line/different_symbols.rs
@@ -0,0 +1,19 @@
+use charming::{
+    component::Axis,
+    element::{AxisType, Symbol},
+    series::Line,
+    Chart,
+};
+
+pub fn chart() -> Chart {
+    Chart::new()
+        .x_axis(
+            Axis::new()
+                .type_(AxisType::Category)
+                .data(vec!["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]),
+        )
+        .y_axis(Axis::new().type_(AxisType::Value))
+        .series(Line::new().data(vec![150, 230, 224, 218, 135, 147, 260])
+        .symbol_size(20)
+        .symbol(Symbol::Callback("function (value, params) { return params.dataIndex % 2 === 0 ? value > 200 ? 'diamond' : 'circle' : 'triangle'; }".into())))
+}
diff --git a/gallery/src/line/mod.rs b/gallery/src/line/mod.rs
index 740f712..12d3bdd 100644
--- a/gallery/src/line/mod.rs
+++ b/gallery/src/line/mod.rs
@@ -3,6 +3,7 @@ pub mod basic_area;
 pub mod basic_line;
 pub mod confidence_band;
 pub mod data_transform_filter;
+pub mod different_symbols;
 pub mod distribution_of_electricity;
 pub mod gradient_stacked_area;
 pub mod large_scale_area;