起源和写法
Hexspeak最早是程序员用来清晰独特地标记内存和数据的一些魔术数字，使用以0-9与A-F构成的16进制数表示一些简单的英文单词。
Hexspeak的转写规则为：数字“0”表示字母“O”，“1”表示“I”或“L”，“5”表示“S”，“7”表示“T”，“6”、“9”则各自表示“G”与“g”，其它的数字则可利用画谜和Leet的规则来借代字母，例如“defecate”就可用“DEFECA7E”或“DEFEC8”来表示。被称之为：魔术数
16进制魔术数在许多处理器、操作系统和调试工具中都得到应用，且尤常作为调试量使用。
一些崩溃报告可能会含有一个未命名的Exception Type，它将以一个16进制的值（例如：c00010ff）的形式打印。假如设备收到了一个这样的崩溃报告，直接查看Exception Codes字段寻找更多的信息。
以下几个常见的：Exception Code：
0xbaaaaaad：此种类型的log意味着该Crash log并非一个真正的Crash，它仅仅只是包含了整个系统某一时刻的运行状态。通常可以通过同时按Home键和音量键，手机死机的时候，会如此操作。
0xbad22222：当VOIP程序在后台太过频繁的激活时，系统可能会终止此类程序
0x8badf00d：程序被watch dog终止。应用花费太长时间启动、响应系统事件。通常导致这个问题是做了在主线程执行了同步的请求。无论什么操作在Thread 0都需要移动到后台线程，或者异步处理，以免它阻塞主线程。
0xc00010ff：程序执行大量耗费CPU和GPU的运算，导致设备过热，触发系统过热保护被系统终止。为了使应用更高效运行可以查看WWDC session iOS Performance and Power Optimization with Instruments。
0xdead10cc：程序退到后台时还占用系统资源（如通信录数据库） ，被系统终止。
0xdeadfa11：表明应用被用户强制退出。强制退出发生在当用户第一次按下开关机按钮直到"滑动来关机"出现，系统强制退出任何正在运行的任务。
全部Exception Code：
Many computer processors, operating systems, and debuggers make use of magic numbers, especially as a magic debug value。
0x0000000FF1CE： ("office") is used as the last part of product codes (GUID) for Microsoft Office components (Visible in registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall registry key).
0x00BAB10C： ("oo-ba-block") is used as the magic number for the [ZFS] uberblock.
0x8BADF00D：("ate bad food") is used by [Apple] in [iOS] crash reports, when an application takes too long to launch, terminate, or respond to system events.
0x1BADB002："1 bad boot" Multiboot header magic number.
0x1CEB00DA： ("ice buddha") was used as the origin for the binary file parser IceBuddha.
0xB105F00D： ("BIOS food") is the value of the low bytes of last four registers on ARM PrimeCell compatible components（the component_id registers）,used to identify correct behavior of a memory-mapped component。
0xB16B00B5： ("big boobs") was required by Microsoft‘s Hyper-V hypervisor to be used by Linux guests as their "guest signature". One proposal suggested changing it to 0x0DEFACED ("defaced").Actually，it was initially changed to decimal and then replaced entirely。
0xBAAAAAAAD： ("baaaaaaad") is used by Apple’s iOS exception report to indicate that the log is a stackshot of the entire system，not a crash report。
0xBAADF00D： ("bad food") is used by Microsoft‘s LocalAlloc(LMEM_FIXED) to indicate uninitialised allocated heap memory when the debug heap is used.
0xBAD22222：("bad too repeatedly") is used by Apple’s iOS exception log to indicate that a VoIP application has been terminated by iOS because it resumed too frequently
0xBADA55：("bad ass") citation needed
0xBADDCAFE： ("bad cafe") is used by Libumem to indicate uninitialized memory area
0xC00010FF：("cool off") is used by Apple in iOS crash reports，when application was killed in response to thermal event
C15C:0D06:F00D： ("cisco dog food") used in the IPv6 address of www.cisco.com on World IPv6 Day. "Dog food" refers to Cisco eating its own dog foodwith IPv6.
0xCAFEBABE： ("cafe babe") is used by plan 9’s libc as a poison value for memory pools。It is also used by Mach-O to identify Universal object files, and by the Java programming language to identify Java bytecode class files.It was originally created by NeXTSTEP developers as a reference to the baristas at Peet’s Coffee & Tea。
0xCAFED00D： ("Cafe Dude") is used by Java as a magic number for their pack200 compression.
0xCEFAEDFE： ("face feed") is used by Mach-O to identify flat （single architecture）object files. In little endian this reads FACEFEED, "Face Feed".
0xD15EA5E： ("disease") is a flag that indicates regular boot on the Nintendo GameCube and Wii consoles.
0xDABBAD00： ("dabba doo") is the name of a blog on computer security.
0xDEADBAAD： ("dead bad") is used by the Android libc abort() function whennative heap corruption is detected.
0xDEADBABE： ("dead babe") is used by IBM Jikes RVM as a sanity check of the stack of the primary thread
0xDEADBEAF： ("dead beaf") is part of the signature code of Jazz jackrabbit 2 tileset files. Level files have less room for their signatures and use 0xBABE（”babe”）instead. It is also the header of campaign gamesaves used in the Halo Game Series.
Deadbeef-dead-beef-dead-beef0000075：(“dead beef”) is the GUID assigned to hung/dead virtual machines in Citrix XenServer.
**0xDEADBEEF **：("dead beef") is frequently used to indicate a software crash or deadlock in embedded systems. 0xDEADBEEF was originally used to mark newly allocated areas of memory that had not yet been initialized -- when scanning a memory dump, it is easy to see the 0xDEADBEEF. It is used by IBM RS/6000 systems, Mac OS on 32-bit PowerPC processors and the Commodore Amiga as a magic debug value. On Sun Microsystems‘ Solaris, it marks freed kernel memory. On OpenVMS running on Alpha processors, 0xDEADBEEF can be seen by pressing CTRL-T. The DEC Alpha SRM console has a background process that traps memory errors, identified by PS as "BeefEater waiting on 0xdeadbeef".
0xDEADC0DE： ("dead code") is used as a marker in OpenWRT firmware to signify the beginning of the to-be created jffs2 filesystem at the end of the static firmware.
0xDEADDEAD： ("dead dead") is the bug check (STOP) code displayed when invoking a Blue Screen of Death either by telling the kernel via the attached debugger, or by using a special keystroke combination. This is usually seen by driver developers, as it is used to get a memory dump on Windows NT based systems. An alternative to 0xDEADDEAD is the bug check code 0x000000E2,as they are both called MANUALLY_INITIATED_CRASH as seen on the Microsoft Developer Network.
0xDEADD00D： ("dead dude") is used by Android in the Dalvik virtual machine to indicate a VM abort.
**0xDEADFA11： ("dead fall") is used by Apple in iOS crash reports, when the user force quits an application.
0xDEAD10CC： ("dead lock") is used by Apple in iOS crash reports, when application holds on to a system resource while running in the background.
0xDEADFEED： ("dead feed") is used by Apple in iOS crash report，when a timeout occurs spawning a service.
0xDEFEC8ED： ("defecated") is the magic number for OpenSolaris core dumps.
0xE011CFD0： is used as magic number for Microsoft Office files. In little endian this reads D0CF11E0, "docfile0".
face:b00c： ("facebook") used in the IPv6 address of www.v6.facebook.com
0xFACEFEED： ("face feed") is used by Alpha servers running Windows NT. The Alpha Hardware Abstraction Layer (HAL) generates this error when it encounters a hardware failure.
0xFBADBEEF： ("bad beef") is used in the WebKit and Blink layout engines to indicate a known，unrecoverable error such as out of memory.
0xFEE1DEAD： ("feel dead") is used as a magic number in the Linux reboot system call.
0xFEEDBABE： ("feel babe") is the magic number used to indicate the beginning of an OpenRG flash partition descriptor.
0xFEEDFACECAFEBEEF： ("feel face café beef") is the magic number used to send as a password via serial wire to rescue some NXP.created controller devices from boot failures.
0x4B1D：(“forbid den”)war a password in some calibration consoles for developers to peer deeper into control registers outside the normal calibration memory range.
0xB000 0xDEAD： ("boo dead") war displayed by the HP 9000 Model 840 when it crashed.
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