diff --git a/.gitignore b/.gitignore
index c9494d2..9a4ef36 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,8 @@ __pycache__
 coverage
 cobertura.xml
 codecov
-codecov.*
\ No newline at end of file
+codecov.*
+.DS_Store
+._.DS_Store 
+**/.DS_Store 
+**/._.DS_Store
\ No newline at end of file
diff --git a/libs/braillify/src/symbol_shortcut.rs b/libs/braillify/src/symbol_shortcut.rs
index 46f7ca3..4ef2cdb 100644
--- a/libs/braillify/src/symbol_shortcut.rs
+++ b/libs/braillify/src/symbol_shortcut.rs
@@ -43,6 +43,7 @@ static SHORTCUT_MAP: phf::Map<char, &'static [u8]> = phf_map! {
     // '×' => &[decode_unicode('⠸'),decode_unicode('⠭'), decode_unicode('⠇')],
     '△' => &[decode_unicode('⠸'),decode_unicode('⠬'), decode_unicode('⠇')],
     '□' => &[decode_unicode('⠸'),decode_unicode('⠶'), decode_unicode('⠇')],
+    'ː' => &[decode_unicode('⠰'), decode_unicode('⠂')],
 };
 
 pub fn encode_char_symbol_shortcut(text: char) -> Result<&'static [u8], String> {
diff --git a/rule_map.json b/rule_map.json
index fffc957..9313079 100644
--- a/rule_map.json
+++ b/rule_map.json
@@ -219,6 +219,10 @@
     "title": "59항",
     "description": "쌍반점(;)은 ⠰⠆으로 적으며, 앞은 붙여 쓰고 뒤는 한 칸 띄어 쓴다."
   },
+  "rule_63": {
+    "title": "63항",
+    "description": "긴소리표(ː)는 ⠰⠂으로 적고, 앞뒤를 붙여 쓴다."
+  },
   "sentence": {
     "title": "문장",
     "description": "테스트를 위한 문장"
diff --git a/test_cases/rule_63.csv b/test_cases/rule_63.csv
new file mode 100644
index 0000000..84ede68
--- /dev/null
+++ b/test_cases/rule_63.csv
@@ -0,0 +1 @@
+밤ː나무,"^5,ce",243448291713,⠘⠢⠰⠂⠉⠑⠍
\ No newline at end of file