{$ IMAGEBASE $ 13140000} in a module from the extended interception / insert library: explanation required

What i have done so far:

I found it in the AfxCodeHook.pas block from Aphex.

I also looked at a bunch of interesting code examples using it:

• Inject Library (how to add a DLL to another process).
• Inject Library Ex (how to add a DLL to another process using the Ex method).
• Create Process Ex (how to add a DLL to the created process using the Ex method).
• Inject Executable (InjectLibraryEx true power: the ability to insert EXE files).
• Simple Api Hooking (how to use afxcodehook to manage calls in windows apis).

I also read:

• Embarcadero RAD Studio Help Recording on Image base addressand
• Base address on Wikipedia.

Question:

I am looking for a reasonable opinion and a simple explanation of the {$ IMAGEBASE $ 13140000} directive in Layman Terms from experienced Delphi codecs.