diff --git a/lang.txt b/lang.txt
index 242b8d8..8c8961b 100644
--- a/lang.txt
+++ b/lang.txt
@@ -12,7 +12,7 @@
 
 	assignment syntax
 		(k := 20) -> (set k 20)
-		k := 20  -> (set  k 20)
+		k := 20  -> (set k 20)
 		[a, b] := (multi-retvar-fun 10 20) -> (set-r a b (multi-retvar-fun 10 20))
 
 	implement module -> ::, ., or what notation?
@@ -22,9 +22,21 @@
 	dynamic byte array is supported but we need yet to support byte-string(byte-array) constant
 		b"..." or B"..." for an byte string constant notation
 		u"..." or U"..." for an explicit unicode string constant notation?
+		-> change u to c???
 
-		#b[ ] byte array??
 		#[ ] normal array?
+		#b[ ] byte array??
+		#c[ ] charcter array??
+		#w[ ] word array??
+		#hw[ ] half-word array??
+		#u8[ ]
+		#u16[ ]
+		#u32[ ]
+		#u64[ ]
+		#i8[ ]
+		#i16[ ]
+		#i32[ ]
+		#i64[ ]
 
 	allow b'X' or 'X' in byte array in #b[] notation?
 
diff --git a/lib/hcl-prv.h b/lib/hcl-prv.h
index 46dbeb2..5b9dc5a 100644
--- a/lib/hcl-prv.h
+++ b/lib/hcl-prv.h
@@ -199,10 +199,16 @@ enum hcl_tok_type_t
 #define HCL_TOK_LPARCOLON HCL_TOK_LPARCOLON
 #endif
 
-	HCL_TOK_BAPAREN,   /* #[ - byte array parenthesis */
+	HCL_TOK_APAREN,    /* #[ - array parenthesis */
+	HCL_TOK_BAPAREN,   /* #b[ - byte array parenthesis */
+#if 0
+	HCL_TOK_CAPAREN,   /* #c[ - character array parenthesis */
+	HCL_TOK_WAPAREN,   /* #w[ - word array parenthesis */
+	HCL_TOK_WAPAREN,   /* #hw[ - half-word array parenthesis */
+#endif
 	HCL_TOK_QLPAREN,   /* #( - quoted-list parenthesis */
 	HCL_TOK_DLPAREN,   /* #{ - dictionary parenthese */
-	HCL_TOK_LBRACK,    /* [ - array */
+	HCL_TOK_LBRACK,    /* [ - group */
 	HCL_TOK_RBRACK,    /* ] */
 	HCL_TOK_LBRACE,    /* { - block */
 	HCL_TOK_RBRACE,    /* } */
@@ -765,7 +771,7 @@ struct hcl_compiler_t
 				hcl_flx_pn_t pn; /* plain number */
 				hcl_flx_qt_t qt; /* quoted token */
 				hcl_flx_st_t st; /* signed token */
-				hcl_flx_st_t bu; /* b or u prefix */
+				hcl_flx_bu_t bu; /* b or u prefix */
 			} u;
 		} lx;
 
diff --git a/lib/print.c b/lib/print.c
index adc8174..8f48f2e 100644
--- a/lib/print.c
+++ b/lib/print.c
@@ -219,8 +219,8 @@ int hcl_fmt_object_ (hcl_fmtout_t* fmtout, hcl_oop_t obj)
 		{ "(",       "(" },  /*HCL_CONCODE_MLIST */
 		{ "(",       "(" },  /*HCL_CONCODE_ALIST */
 		{ "{",       "{" },  /*HCL_CONCODE_BLOCK */
-		{ "[",       "[" },  /*HCL_CONCODE_ARRAY */
-		{ "#[",      "[" },  /*HCL_CONCODE_BYTEARRAY */
+		{ "#[",      "[" },  /*HCL_CONCODE_ARRAY */
+		{ "#b[",     "[" },  /*HCL_CONCODE_BYTEARRAY */
 		{ "#{",      "{" },  /*HCL_CONCODE_DIC */
 		{ "#(",      "[" }   /*HCL_CONCODE_QLIST */
 	};
diff --git a/lib/read.c b/lib/read.c
index 9474eed..9667006 100644
--- a/lib/read.c
+++ b/lib/read.c
@@ -62,8 +62,8 @@ static struct voca_t
 	{  4, { '(',':',' ',')'  /* MLIST */                                  } },
 	{  3, { '(',':','=',')'  /* ALIST */                                  } },
 	{  3, { '{',' ','}'      /* BLOCK */                                  } },
-	{  3, { '[',' ',']'      /* ARRAY */                                  } },
-	{  4, { '#','[',' ',']'                                               } },
+	{  4, { '#','[',' ',']'  /* ARRAY */                                  } },
+	{  5, { '#','b','[',' ',']' /* BYTE ARRAY */                          } },
 	{  4, { '#','{',' ','}'                                               } },
 	{  4, { '#','(',' ',')'                                               } },
 	{  3, { '|',' ','|'                                                   } },
@@ -1174,6 +1174,7 @@ static int feed_process_token (hcl_t* hcl)
 			}
 
 		case HCL_TOK_LBRACK: /* [ */
+		case HCL_TOK_APAREN: /* #[ */
 			/* [] is a data list. so let's treat it like other literal
 			 * expressions(e.g. 1, "abc"). when it's placed at the block beginning,
 			 * create the outer XLIST. */
@@ -1183,7 +1184,7 @@ static int feed_process_token (hcl_t* hcl)
 			LIST_FLAG_SET_CONCODE (frd->flagv, HCL_CONCODE_ARRAY);
 			goto start_list;
 
-		case HCL_TOK_BAPAREN: /* #[ */
+		case HCL_TOK_BAPAREN: /* #b[ */
 			if (auto_forge_xlist_if_at_block_beginning(hcl, frd) <= -1) goto oops;
 
 			frd->flagv = DATA_LIST;
@@ -2019,15 +2020,15 @@ static int flx_hmarked_token (hcl_t* hcl, hcl_ooci_t c)
 			goto consumed;
 
 		/* --------------------------- */
-		case '[':
-			FEED_WRAP_UP_WITH_CHAR (hcl, c, HCL_TOK_BAPAREN);
+		case '[': /* #[ */
+			FEED_WRAP_UP_WITH_CHAR (hcl, c, HCL_TOK_APAREN);
 			goto consumed;
 
-		case '(':
+		case '(': /* #( */
 			FEED_WRAP_UP_WITH_CHAR (hcl, c, HCL_TOK_QLPAREN);
 			goto consumed;
 
-		case '{':
+		case '{': /* #{ */
 			FEED_WRAP_UP_WITH_CHAR (hcl, c, HCL_TOK_DLPAREN);
 			goto  consumed;