Allows you to draw a shape, which it then searches for similarly shaped unicode symbols.
I often end up using shapecatcher these days just because it's a fun break just to be able to draw the shape that you want and have the site pull it up for you. At least, sometimes it will pull it up.
It's the parental lock, which is a key inside a square. It's a newer Unicode specification so standard fonts don't support it, but if you can find a font that has it, you're home free.
I've found Google to be the best way to find Unicode characters. I didn't find see anything useful for a key symbol, however.
If you want to search visually, use the PDF charts, since HTML-based listings will only show symbols that occur in the particular set of fonts you have installed.
Lacking any specific symbol, I would just use "I" to indicate an index and "PK" for a primary key.
There doesn't seem to be a unicode character that fits your description, but I'd recommend the silk icon set by famfamfam if you can use icons in your situation--just a suggestion :P
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U+1F511
U+1F511 ???? KEY
(128273 decimal)
Also:
U+1F5DD ???? (Decimal: 🗝) OLD KEY
U+26BF ⚿ SQUARED KEY
U+1F510 ???? CLOSED LOCK WITH KEY
U+1F512 ???? LOCK
U+1F513 ???? OPEN LOCK
U+1F50F ???? LOCK WITH INK PEN
为了找到有用的符号，我有这个资源：
http://shapecatcher.com
允许您绘制一个形状，然后它搜索形状相似的 unicode 符号。
这些天我经常使用 shapecatcher，因为这是一个有趣的休息，能够绘制你想要的形状并让网站为你拉出来。至少，有时候它会把它拉起来。
杂项。符号块
http://shapecatcher.com/unicode/block/Miscellaneous_Symbols_And_Pictographs 也是一个很棒的类别unicode 符号，尽管与所有 unicode 一样，您可能必须测试兼容性。
这与我在这里的答案重复，因为我认为该方法除了我之外对其他人也有用： 您在网站中使用什么 Unicode 字符？ （而不是图像图标）
To find useful symbols, I have this resource:
http://shapecatcher.com
Allows you to draw a shape, which it then searches for similarly shaped unicode symbols.
I often end up using shapecatcher these days just because it's a fun break just to be able to draw the shape that you want and have the site pull it up for you. At least, sometimes it will pull it up.
Misc. Symbols Blocks
http://shapecatcher.com/unicode/block/Miscellaneous_Symbols_And_Pictographs is also a great category of unicode symbols, though as with all unicode, you may have to test compatibility.
This is duplicated from my answer here because I think the approach will be useful to others besides just me: What Unicode character do you use in your website? (instead of image icons)
我使用了一些Python 3脚本来查看，我发现的最接近的并没有显示在此处（在我的机器上的空闲中显示），但它是：（
看起来像一个指向右侧的男性标志，在箭头和圆圈）
我使用Python的unicodedata模块在unicode名称中搜索了各种匹配项，例如“KEY”和“LOCK”，但没有运气。
编辑添加 - 啊哈哈 - 一个看起来更像一把钥匙的：
我给出了以上两个内容十进制代码点。要查看它们及其十六进制代码，请访问此链接：
http://www.unicode。 org/charts/PDF/U2600.pdf
请参阅 26B7，特别是 Chiron。
I used a little Python 3 script to look, and the closest I found does not display here for me (does display in Idle on my machine), but it is:
(Looks like a male sign pointed right with a perpendicular stroke added between the arrow and circle)
I searched for various matches like "KEY" and "LOCK" in the unicode names using Python's unicodedata module and no luck there.
Editing to add - Ah hah - one that looks even more like a key:
I give both of the above code points in decimal. To see them and their hex codes, go to this link:
http://www.unicode.org/charts/PDF/U2600.pdf
See 26B7 in particular for the Chiron.
看看#26bf。
这是父母锁，是一把位于正方形内的钥匙。它是较新的 Unicode 规范，因此标准字体不支持它，但如果您能找到支持它的字体，那么您就可以放心了。
Check out #26bf.
It's the parental lock, which is a key inside a square. It's a newer Unicode specification so standard fonts don't support it, but if you can find a font that has it, you're home free.
我发现 Google 是查找内容的最佳方式统一码字符。然而，我没有发现任何对关键符号有用的东西。
如果您想直观地搜索，请使用 PDF 图表，因为 基于 HTML 的列表 将仅显示您拥有的特定字体集中出现的符号安装。
由于缺少任何特定符号，我只会使用“I”来表示索引，使用“PK”来表示主键。
I've found Google to be the best way to find Unicode characters. I didn't find see anything useful for a key symbol, however.
If you want to search visually, use the PDF charts, since HTML-based listings will only show symbols that occur in the particular set of fonts you have installed.
Lacking any specific symbol, I would just use "I" to indicate an index and "PK" for a primary key.
我浏览了所有符号（使用我不久前创建的 PHP 脚本），但看不到关键符号。您可以尝试其中之一：
看起来像数学的 P：
ℙ (
#8473)各种星形：
★ (
#9733)☆（
#9734）✶（
#10038）I browsed through all the symbols (using a PHP script I created a while back) and can't see a key symbol. You could try one of these:
A mathematic-looking P:
ℙ (
#8473)Various star shapes:
★ (
#9733)☆ (
#9734)✶ (
#10038)似乎没有符合您的描述的 unicode 字符，但我推荐 如果您可以在您的情况下使用图标，则由 famfamfam 设置丝绸图标 - 只是一个建议：P
There doesn't seem to be a unicode character that fits your description, but I'd recommend the silk icon set by famfamfam if you can use icons in your situation--just a suggestion :P