用Alt码打出Pi以及各式各样的符号

使用方法：
确认NumLock开启，按住Alt键，然后一次在小键盘上点击这些数字然后松开Alt键即可。

（部分为自己尝试得出，其余收集与网络）

Alt+33 !
Alt+34 ”
Alt+35 #
Alt+36 $
Alt+37 %
Alt+38 &
Alt+39
Alt+40 (
Alt+41 )
Alt+42 *
Alt+43 +
Alt+44 ,
Alt+45 -
Alt+46 .
Alt+60 <
Alt+61 =
Alt+62 >
Alt+63 ?
Alt+64 @

Alt+65 - Alt+90 A-Z

Alt+91 [
Alt+92 \
Alt+93 ]
Alt+94 ^
Alt+95 _
Alt+96 `

Alt+97 - Alt+122 a-z

Alt+123 {
Alt+124 |
Alt+125 }
Alt+126 ~
Alt+128 €
Alt+130 ‚
Alt+131 ƒ
Alt+132 „
Alt+133 …
Alt+134 †
Alt+135 ‡
Alt+136 ˆ
Alt+137 ‰
Alt+138 Š
Alt+139 ‹
Alt+140 Œ
Alt+145 ‘
Alt+146 ’
Alt+147 “
Alt+148 ”
Alt+149 •
Alt+150 –
Alt+151 —
Alt+152 0˜
Alt+153 ™
Alt+154 š
Alt+155 ›
Alt+156 œ
Alt+158 ž
Alt+159 Ÿ
Alt+160 ¡
Alt+161 ¢