diff --git a/SLS_C/include/sls/interpreter.h b/SLS_C/include/sls/interpreter.h
new file mode 100644
index 0000000..8a8b3d6
--- /dev/null
+++ b/SLS_C/include/sls/interpreter.h
@@ -0,0 +1,31 @@
+// Kyler Olsen
+// YREA SLS
+// Interpreter Header
+// November 2025
+
+#ifndef SLS_INTERPRETER_H
+#define SLS_INTERPRETER_H
+
+#include <stddef.h>
+
+typedef enum {
+    STACK_IDENTIFIER,
+    STACK_I64,
+    STACK_I32,
+    STACK_I16,
+    STACK_I8,
+    STACK_U64,
+    STACK_U32,
+    STACK_U16,
+    STACK_U8,
+    STACK_FLOAT,
+    STACK_DOUBLE,
+    STACK_CHARACTER,
+    STACK_BOOLEAN,
+    STACK_TOKEN_STRING,
+} StackTypes;
+
+extern const char *STACK_TYPES_NAMES[];
+extern const size_t STACK_TYPE_COUNT;
+
+#endif // SLS_INTERPRETER_H
diff --git a/SLS_C/src/interpreter.c b/SLS_C/src/interpreter.c
new file mode 100644
index 0000000..2940e8a
--- /dev/null
+++ b/SLS_C/src/interpreter.c
@@ -0,0 +1,25 @@
+// Kyler Olsen
+// YREA SLS
+// Interpreter
+// November 2025
+
+#include "sls/interpreter.h"
+
+const char *STACK_TYPES_NAMES[] = {
+    "Identifier",
+    "64-bit Integer",
+    "32-bit Integer",
+    "16-bit Integer",
+    "8-bit Integer",
+    "64-bit U Integer",
+    "32-bit U Integer",
+    "16-bit U Integer",
+    "8-bit U Integer",
+    "Float",
+    "Double",
+    "Character",
+    "Boolean",
+    "Token String",
+};
+
+const size_t STACK_TYPE_COUNT = sizeof(STACK_TYPES_NAMES) / sizeof(*STACK_TYPES_NAMES);