Add special symbols on LCD

SW/Render.h

 #pragma once
 
 #define MAX_LENGHT    15
-#define ARROW_UP    0x1E
-#define ARROW_DOWN  0x1F
 
 
+enum symbols
+{
+    SQUARED             = 0x1E,
+    THIRD               = 0x1F,
+    DEGREE              = 0xB2,
+    DOUBLE_ARROW_LEFT   = 0xBB,
+    DOUBLE_ARROW_RIGHT  = 0xBC,
+    ARROW_RETURN        = 0xC4,
+    ARROW_UP            = 0xC5,
+    ARROW_DOWN          = 0xC6,
+    ARROW_RIGHT         = 0xC7,
+    ARROW_LEFT          = 0xC8,
+    MI                  = 0xEA
+};
+
 //MAX "xxxxxxxxxxxxxxx"
 
 struct menu