diff --git a/lib/LaTeXML/Engine/plain.pool.ltxml b/lib/LaTeXML/Engine/plain.pool.ltxml
index 873627b31..2473d9aef 100644
--- a/lib/LaTeXML/Engine/plain.pool.ltxml
+++ b/lib/LaTeXML/Engine/plain.pool.ltxml
@@ -47,28 +47,20 @@ DefMacro('\brack',
 #======================================================================
 # Special Characters.
 # Try to give them some sense in math...
-DefMacroI('\#',   undef, '\ifmmode\lx@math@hash\else\lx@text@hash\fi',             protected => 1);
-DefMacroI('\&',   undef, '\ifmmode\lx@math@amp\else\lx@text@amp\fi',               protected => 1);
-DefMacroI('\%',   undef, '\ifmmode\lx@math@percent\else\lx@text@percent\fi',       protected => 1);
-DefMacroI("\\\$", undef, '\ifmmode\lx@math@dollar\else\lx@text@dollar\fi',         protected => 1);
-DefMacroI('\_',   undef, '\ifmmode\lx@math@underscore\else\lx@text@underscore\fi', protected => 1);
-DefPrimitiveI('\lx@text@hash',       undef, '#',  alias => '\#');
-DefPrimitiveI('\lx@text@amp',        undef, '&',  alias => '\&');
-DefPrimitiveI('\lx@text@percent',    undef, '%',  alias => '\%');
-DefPrimitiveI('\lx@text@dollar',     undef, "\$", alias => "\\\$");
-DefPrimitiveI('\lx@text@underscore', undef, '_',  alias => '\_');
-DefMathI('\lx@math@hash',    undef, '#', alias => '\#');
-DefMathI('\lx@math@amp',     undef, '&', role  => 'ADDOP',   meaning => 'and',     alias => '\&');
-DefMathI('\lx@math@percent', undef, '%', role  => 'POSTFIX', meaning => 'percent', alias => '\%');
-DefMathI('\lx@math@dollar', undef, "\$", role => 'OPERATOR', meaning => 'currency-dollar',
-  alias => "\\\$");
-DefMathI('\lx@math@underscore', undef, '_', alias => '\_');
+DefPrimitive('\#', sub {
+    Box('#', undef, undef, T_CS('\#')); });
+DefPrimitive('\&', sub {
+    Box('&', undef, undef, T_CS('\&'), role => 'ADDOP', meaning => 'and'); });
+DefPrimitive('\%', sub {
+    Box('%', undef, undef, T_CS('\%'), role => 'POSTFIX', meaning => 'percent'); });
+DefPrimitive('\$', sub {
+    Box('$', undef, undef, T_CS('\$'), role => 'OPERATOR', meaning => 'currency-dollar'); });
+DefPrimitive('\_', sub {
+    Box('_', undef, undef, T_CS('\_')); });
 
 # Discretionary times; just treat as invisible ?
 DefMathI('\*', undef, "\x{2062}", role => 'MULOP', name => '', meaning => 'times'); # INVISIBLE TIMES (or MULTIPLICATION SIGN = 00D7)
 
-# These 3 should have some `name' assigned ... but what???
-
 #======================================================================
 # If an XMWrap (presumably from \mathop, \mathbin, etc)
 # has multiple children, ALL are XMTok, within a restricted set of roles,
diff --git a/lib/LaTeXML/Util/Unicode.pm b/lib/LaTeXML/Util/Unicode.pm
index 90bc2ed76..dcb6122ca 100644
--- a/lib/LaTeXML/Util/Unicode.pm
+++ b/lib/LaTeXML/Util/Unicode.pm
@@ -340,27 +340,29 @@ our %math_props = (
   "8" => { role => 'NUMBER', meaning => 8 },
   "9" => { role => 'NUMBER', meaning => 9 },
   #======================================================================
-  '=' => { role => 'RELOP',   meaning => 'equals' },
-  '+' => { role => 'ADDOP',   meaning => 'plus' },
-  '-' => { role => 'ADDOP',   meaning => 'minus' },
-  '*' => { role => 'MULOP',   meaning => 'times' },
-  '/' => { role => 'MULOP',   meaning => 'divide' },
-  '!' => { role => 'POSTFIX', meaning => 'factorial' },
-  ',' => { role => 'PUNCT' },
-  '.' => { role => 'PERIOD' },
-  ';' => { role => 'PUNCT' },
-  ':' => { role => 'METARELOP', name     => 'colon' },          # plausible default?
-  '|' => { role => 'VERTBAR',   stretchy => 'false' },
-  '<' => { role => 'RELOP',     meaning  => 'less-than' },
-  '>' => { role => 'RELOP',     meaning  => 'greater-than' },
-  '(' => { role => 'OPEN',      stretchy => 'false' },
-  ')' => { role => 'CLOSE',     stretchy => 'false' },
-  '[' => { role => 'OPEN',      stretchy => 'false' },
-  ']' => { role => 'CLOSE',     stretchy => 'false' },
-  '{' => { role => 'OPEN',      stretchy => 'false' },
-  '}' => { role => 'CLOSE',     stretchy => 'false' },
-  '&' => { role => 'ADDOP',     meaning  => 'and' },
-##  ':'        => { role => 'METARELOP' },    # \colon # Seems like good default role
+  '='     => { role => 'RELOP',   meaning => 'equals' },
+  '+'     => { role => 'ADDOP',   meaning => 'plus' },
+  '-'     => { role => 'ADDOP',   meaning => 'minus' },
+  '*'     => { role => 'MULOP',   meaning => 'times' },
+  '/'     => { role => 'MULOP',   meaning => 'divide' },
+  '!'     => { role => 'POSTFIX', meaning => 'factorial' },
+  ','     => { role => 'PUNCT' },
+  '.'     => { role => 'PERIOD' },
+  ';'     => { role => 'PUNCT' },
+  ':'     => { role => 'METARELOP', name     => 'colon' },             # plausible default?
+  '|'     => { role => 'VERTBAR',   stretchy => 'false' },
+  '<'     => { role => 'RELOP',     meaning  => 'less-than' },
+  '>'     => { role => 'RELOP',     meaning  => 'greater-than' },
+  '('     => { role => 'OPEN',      stretchy => 'false' },
+  ')'     => { role => 'CLOSE',     stretchy => 'false' },
+  '['     => { role => 'OPEN',      stretchy => 'false' },
+  ']'     => { role => 'CLOSE',     stretchy => 'false' },
+  '{'     => { role => 'OPEN',      stretchy => 'false' },
+  '}'     => { role => 'CLOSE',     stretchy => 'false' },
+  '&'     => { role => 'ADDOP',     meaning  => 'and' },
+  '&amp;' => { role => 'ADDOP',     meaning  => 'and' },
+  '%'     => { role => 'POSTFIX',   meaning  => 'percent' },
+  '$'     => { role => 'OPERATOR',  meaning  => 'currency-dollar' },
 
   #======================================================================
   UTF(0x5C) => { role => 'ADDOP', meaning => 'set-minus' },        # \backslash