h4>function IsNan(const d : Single): Boolean;</h4><br>
	IsNan returns True if the single d contains Not A Number (a value which cannot be represented correctly in single format).<br><ul></ul></td></tr>
<tr><td class='tname fname'>Sign</td><td class='tdesc'><h4>function Sign(const AValue: Integer): shortint; overload;</h4><br>
	Return sign of argument<br><ul><h5>parameters:</h5><li>AValue - Integer</li></ul></td></tr>
<tr><td class='tname fname'>Sign</td><td class='tdesc'><h4>function Sign(const AValue: Real