为什么按ALT再加上数字可以打出符号?

　　么按ALT再加上数字可以打出符号，这个应该是计算机系统程序，计算机内部已经设置好了的，也没有什么解释原因。
　　常用的Alt+数字所产生出来的符号对照
　　Alt+41400 = ☆ Alt+41416 = ﹍ Alt+41432 = ≦ Alt+41448 = ∟ Alt+41464 = ↖
　　Alt+41401 = ★ Alt+41417 = ﹎ Alt+41433 = ≧ Alt+41449 = ⊿ Alt+41465 = ↗
　　Alt+41402 = ◇ Alt+41418 = ﹋ Alt+41434 = ≠ Alt+41450 = ㏒ Alt+41466 = ↙
　　Alt+41403 = ◆ Alt+41419 = ﹌ Alt+41435 = ∞ Alt+41451 = ㏑ Alt+41467 = ↘
　　Alt+41404 = □ Alt+41420 = ﹟ Alt+41436 = ≒ Alt+41452 = ∫ Alt+41468 = ∥
　　Alt+41405 = ■ Alt+41421 = ﹠ Alt+41437 = ≡ Alt+41453 = ∮ Alt+41469 = ∣
　　Alt+41406 = ▽ Alt+41422 = ﹡ Alt+41438 = ﹢ Alt+41454 = ∵ Alt+41470 = ／
　　Alt+41407 = ▼ Alt+41423 = ＋ Alt+41439 = ﹣ Alt+41455 = ∴ Alt+41556 = ㎡
Alt+41408 = ㊣ Alt+41424 = － Alt+41440 = ﹤ Alt+41456 = ♀ Alt+41536 = ＼
　　Alt+41409 = ℅ Alt+41425 = × Alt+41441 = ﹥ Alt+41457 = ♂ Alt+41560 = °Alt+41410 = ¯ Alt+41426 = ÷ Alt+41442 = ﹦ Alt+41458 = ⊕ Alt+41646 = ╳
　　Alt+41411 = ￣ Alt+41427 = ± Alt+41443 = ～ Alt+41459 = ⊙ Alt+41396 = ●
　　Alt+41412 = ＿ Alt+41428 = √ Alt+41444 = ∩ Alt+41460 = ↑ Alt+41399 = ◎
　　Alt+41413 = ˍ Alt+41429 = ＜ Alt+41445 = ∪ Alt+41461 = ↓ Alt+41540 = ￥
　　Alt+41414 = ﹉ Alt+41430 = ＞ Alt+41446 = ⊥ Alt+41462 = ← Alt+41598 = ╭
　　Alt+41415 = ﹊ Alt+41431 = ＝ Alt+41447 = ∠ Alt+41463 = → Alt+41633 = ╮
　　Alt+41634 = ╰ Alt+41635 = ╯ Alt+41411 = ￣ Alt+41593 = ▕ Alt+41392 = ※
　　Alt+41570 = ▁ Alt+41571 = ▂ Alt+41572 = ▃ Alt+41573 = ▄ Alt+41574 = ▅
　　Alt+41575 = ▆ Alt+41576 = ▇ Alt+41577 = █ Alt+177 = ± Alt+41541 = 〒
　　Alt+41657 = Ⅰ Alt+41658 = Ⅱ Alt+41659 = Ⅲ Alt+41660 = Ⅳ Alt+41661 = Ⅴ
　　Alt+41662 = Ⅵ Alt+41663 = Ⅶ Alt+41664 = Ⅷ Alt+41665 = Ⅸ Alt+41666 = Ⅹ
　　Alt+174 = ® Alt+185 = ¹ Alt+178 = ² Alt+179 = ³ Alt+188 = ¼
　　Alt+189 = ½ Alt+190 = ¾ Alt+41578 = ▏ Alt+41579 = ▎ Alt+41580 = ▍
　　Alt+41581 = ▌ Alt+41582 = ▋ Alt+41583 = ▊ Alt+41584 = ▉ Alt+41640 = ◢
　　Alt+41641 = ◣ Alt+41642 = ◥ Alt+41643 = ◤ Alt+63965 = ╔ Alt+63966 = ╦
　　Alt+63967 = ╗ Alt+63968 = ╠ Alt+63969 = ╬ Alt+63970 = ╣ Alt+63971 = ╚
　　Alt+63972 = ╩ Alt+63973 = ╝ Alt+63993 = ═ Alt+63983 = ╓ Alt+63984 = ╥
　　Alt+63985 = ╖ Alt+63986 = ╟ Alt+63987 = ╫ Alt+63988 = ╢ Alt+63989 = ╙
　　Alt+63990 = ╨ Alt+63991 = ╜ Alt+63992 = ║ Alt+63981 = ╧ Alt+63978 = ╪
　　Alt+41844 = ㄅ Alt+41845 = ㄆ Alt+41846 = ㄇ Alt+41847 = ㄈ Alt+41848 = ㄉ
　　Alt+41849 = ㄊ Alt+41850 = ㄋ Alt+41851 = ㄌ Alt+41852 = ㄍ Alt+41853 = ㄎ
　　Alt+41854 = ㄏ Alt+41889 = ㄐ Alt+41890 = ㄑ Alt+41891 = ㄒ Alt+41892 = ㄓ
　　Alt+41893 = ㄔ Alt+41894 = ㄕ Alt+41895 = ㄖ Alt+41896 = ㄗ Alt+41897 = ㄘ
　　Alt+41898 = ㄙ Alt+41899 = ㄚ Alt+41900 = ㄛ Alt+41901 = ㄜ Alt+41902 = ㄝ
　　Alt+41903 = ㄞ Alt+41904 = ㄟ Alt+41905 = ㄠ Alt+41906 = ㄡ Alt+41907 = ㄢ
　　Alt+41908 = ㄣ Alt+41909 = ㄤ Alt+41910 = ㄥ Alt+41911 = ㄦ Alt+41912 = ㄧ
　　Alt+41913 = ㄨ Alt+41914 = ㄩ Alt+41915 = ˙ Alt+41917 = ˊ Alt+41918 = ˇ
　　Alt+41919 = ˋ Alt+51534 = 冇 Alt+51544 = 厹 Alt+42107 = 廾 Alt+42186 = 卅
　　如果知道与要插入的字元同样的 Unicode，也可以将特殊字元直接插入文件中，不必使用字元对应表。
若要这么做，请开启文件并将插入指标定位到要特殊字元出现的位置。
然后，使 NUM LOCK 键开启，并在使用数字键台的按键来键入 Unicode 字元值时按住 ALT 键。
　　PS：如果要存为记事本格式的档案『常用的Alt+数字所产生出来的符号对照.txt』
如果有些符号无法显示出来( 例如：变成 ▍)请将记事本的字型更改为选择 Gulim 字型
　　操作方式：格式(O)→字型(F)→ 选择 Gulim 字型
　　记事本的预设字型为： Fixedsys 字型(原来的预设字型设定)
　　Alt+9635 = ▣ Alt+9688 = ◘ Alt+9689 = ◙ Alt+9660 = ▼ Alt+9661 = ▽ Alt+8482 = ™ Alt+9733 = ★
　　Alt+9734 = ☆ Alt+9742 = ☎ Alt+9743 = ☏ Alt+9756 = ☜ Alt+9758 = ☞ Alt+9786 = ☺ Alt+9787 = ☻
　　Alt+9788 = ☼ Alt+9792 = ♀ Alt+9824 = ♠ Alt+9825 = ♡ Alt+9827 = ♣ Alt+9828 = ♤ Alt+9829 = ♥
　　Alt+9830 = ♦ Alt+9831 = ♧ Alt+9832 = ♨ Alt+9833 = ♩ Alt+9834 = ♪ Alt+9835 = ♫ Alt+9836 = ♬
　　Alt+9837 =♭
　　Alt+12690 = ㆒ Alt+12691 = ㆓ Alt+12692 = ㆔ Alt+12693 = ㆕
　　Alt+12694 = ㆖ Alt+12695 = ㆗ Alt+12696 = ㆘
　　Alt+12697 = ㆙ Alt+12698 = ㆚ Alt+12699 = ㆛ Alt+12700 = ㆜
　　Alt+12701 = ㆝ Alt+12702 = ㆞ Alt+12703 = ㆟

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