\DeclareUnicodeCharacter{2192}{\expansion} % →
\DeclareUnicodeCharacter{21D2}{\result} % ⇒
-\DeclareUnicodeCharacter{2212}{\euro} % −
+\DeclareUnicodeCharacter{2212}{\minus} % −
\DeclareUnicodeCharacter{2217}{\point} % ∗
\DeclareUnicodeCharacter{2261}{\equiv} % ≡