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@@ -5,6 +5,7 @@ This glossary defines terms, both common and more niche, that are important to u
 
 As much as possible, we should link to the most authoritative and recent source of information for a term. That approach should be the most helpful for people who want to learn more about a topic.
 
+* BBT: Microsoft internal early version of C/C++ PGO. See https://www.microsoft.com/windows/cse/bit_projects.mspx.
 * BOTR: Book Of The Runtime.
 * CLR: Common Language Runtime.
 * COMPlus: An early name for the .NET platform, back when it was envisioned as a successor to the COM platform (hence, "COM+"). Used in various places in the CLR infrastructure, most prominently as a common prefix for the names of internal configuration settings. Note that this is different from the product that eventually ended up being named [COM+](https://msdn.microsoft.com/en-us/library/windows/desktop/ms685978.aspx).
@@ -18,6 +19,8 @@ As much as possible, we should link to the most authoritative and recent source
 * NYI: Not Yet Implemented
 * PAL: [Platform Adaptation Layer](http://archive.oreilly.com/pub/a/dotnet/2002/03/04/rotor.html). Provides an abstraction layer between the runtime and the operating system
 * PE: Portable Executable.
+* PGO: Profile Guided Optimization - see [details](https://blogs.msdn.microsoft.com/vcblog/2008/11/12/pogo/)
+* POGO: Profile Guided Optimization - see [details](https://blogs.msdn.microsoft.com/vcblog/2008/11/12/pogo/)
 * ProjectN: Codename for the first version of [.NET Native for UWP](https://msdn.microsoft.com/en-us/vstudio/dotnetnative.aspx).
 * ReadyToRun: A flavor of native images - command line switch of [crossgen](../building/crossgen.md).
 * Redhawk: Codename for experimental minimal managed code runtime that evolved into [CoreRT](https://github.com/dotnet/corert/).
@@ -29,3 +32,4 @@ As much as possible, we should link to the most authoritative and recent source
 * VSD: [Virtual Stub Dispatch](../botr/virtual-stub-dispatch.md). Technique of using stubs for virtual method invocations instead of the traditional virtual method table.
 * VM: Virtual machine.
 * WKS: The CLR used to be built as two variants, with one called "mscorwks.dll", to mean the "workstation" version. In particular, it contained the client GC implementation, which was intended for single-threaded apps, independent of how many processors were on the machine. In the .NET Framework 2 release, the two variants were merged into "mscorwks.dll". The WKS version was the default, however the SVR version remained available.
+* ZAP: Original code name for NGen