<%
    a="±"
    sub alt(a)
        a=asc(a)
        a=hex(a)
        response.write int("&H" & a)
    end sub
    alt("Φ")
    alt("±")
    alt("×")
    alt("°")
    alt("∮")
%>

常用符号
Φ42677,±41408,×41409,°41443,∮41427

ALT小键盘文字编码计算

a="Φ"
a=asc(a)
a=hex(a)
msgbox int("&H" & a)
42677