diff --git a/build.py b/build.py
index 27061e6..bfb2ae0 100644
--- a/build.py
+++ b/build.py
@@ -15,3 +15,4 @@ bd.build_edition("NEA")
 bd.build_assets()
 bd.build_solutions()
 bd.build_question_index()
+bd.build_zip()
diff --git a/latex/settings.tex b/latex/settings.tex
index 1310043..4bfe1e3 100644
--- a/latex/settings.tex
+++ b/latex/settings.tex
@@ -1087,6 +1087,28 @@
 \pgfcirc@activate@bipole@simple{l}{channelcoder}
 \makeatother
 
+% Channel Decoder
+\makeatletter
+\ctikzset{bipoles/channeldecoder/width/.initial=.7}
+
+\pgfcirc@define@twoports{blocks}
+{}
+{\ctikzvalof{bipoles/channeldecoder/width}}
+{channeldecoder}
+{\ctikzvalof{bipoles/channeldecoder/width}}
+{\ctikzvalof{bipoles/channeldecoder/width}}
+{
+    \pgfcirc@twoport@draw@splitline
+    %
+    \pgf@circ@text@strokecolor
+    \pgftext[center,x=0.25\pgf@circ@res@left,y=0.6\pgf@circ@res@up]{\tiny 01+01}
+    \pgftext[center,x=0.55\pgf@circ@res@right,y=0.6\pgf@circ@res@down]{\tiny 01}
+}
+
+\pgfcirc@activate@bipole@simple{l}{channeldecoder}
+\makeatother
+
+
 % Source Coder
 \makeatletter
 \ctikzset{bipoles/sourcecoder/width/.initial=.7}
@@ -1108,6 +1130,27 @@
 \pgfcirc@activate@bipole@simple{l}{sourcecoder}
 \makeatother
 
+% Source Decoder
+\makeatletter
+\ctikzset{bipoles/sourcedecoder/width/.initial=.7}
+
+\pgfcirc@define@twoports{blocks}
+{}
+{\ctikzvalof{bipoles/sourcedecoder/width}}
+{sourcedecoder}
+{\ctikzvalof{bipoles/sourcedecoder/width}}
+{\ctikzvalof{bipoles/sourcedecoder/width}}
+{
+    \pgfcirc@twoport@draw@splitline
+    %
+    \pgf@circ@text@strokecolor
+    \pgftext[center,x=0.55\pgf@circ@res@left,y=0.6\pgf@circ@res@up]{\tiny 01}
+    \pgftext[center,x=0.30\pgf@circ@res@right,y=0.6\pgf@circ@res@down]{\tiny 0101}
+}
+
+\pgfcirc@activate@bipole@simple{l}{sourcedecoder}
+\makeatother
+
 % Mapper
 \makeatletter
 \ctikzset{bipoles/mapper/width/.initial=.7}
@@ -1147,4 +1190,45 @@
 }
 
 \pgfcirc@activate@bipole@simple{l}{mapper}
+\makeatother
+
+% Demapper
+\makeatletter
+\ctikzset{bipoles/demapper/width/.initial=.7}
+
+\pgfcirc@define@twoports{blocks}
+{}
+{\ctikzvalof{bipoles/demapper/width}}
+{demapper}
+{\ctikzvalof{bipoles/demapper/width}}
+{\ctikzvalof{bipoles/demapper/width}}
+{
+    \pgfcirc@twoport@draw@splitline
+    %
+    \pgf@circ@text@strokecolor
+    %
+    \pgfpathmoveto{\pgfpoint{0.50\pgf@circ@res@left}{+0.25\pgf@circ@res@up}}
+    \pgfpathlineto{\pgfpoint{0.50\pgf@circ@res@left}{+0.75\pgf@circ@res@up}}
+    \pgfusepath{draw}
+    %
+    \pgfpathmoveto{\pgfpoint{0.25\pgf@circ@res@left}{+0.50\pgf@circ@res@up}}
+    \pgfpathlineto{\pgfpoint{0.75\pgf@circ@res@left}{+0.50\pgf@circ@res@up}}
+    \pgfusepath{draw}
+    %
+    \pgfpathcircle{\pgfpoint{0.65\pgf@circ@res@left}{+0.65\pgf@circ@res@up}}{0.05\pgf@circ@res@up}
+    \pgfusepath{fill}
+    %
+    \pgfpathcircle{\pgfpoint{0.35\pgf@circ@res@left}{+0.65\pgf@circ@res@up}}{0.05\pgf@circ@res@up}
+    \pgfusepath{fill}
+    %
+    \pgfpathcircle{\pgfpoint{0.65\pgf@circ@res@left}{+0.35\pgf@circ@res@up}}{0.05\pgf@circ@res@up}
+    \pgfusepath{fill}
+    %
+    \pgfpathcircle{\pgfpoint{0.35\pgf@circ@res@left}{+0.35\pgf@circ@res@up}}{0.05\pgf@circ@res@up}
+    \pgfusepath{fill}
+    %
+    \pgftext[center,x=0.55\pgf@circ@res@right,y=-0.6\pgf@circ@res@up]{\tiny 01}
+}
+
+\pgfcirc@activate@bipole@simple{l}{demapper}
 \makeatother
\ No newline at end of file
diff --git a/main.py b/main.py
index 6574521..5b83092 100644
--- a/main.py
+++ b/main.py
@@ -23,6 +23,7 @@ def main(
     output: Annotated[str | None, typer.Option("--output", "-o", help="Destination directory to build to.")] = None,
     render_editions: Annotated[bool, typer.Option(help="Skip building editions.")] = True,
     render_solutions: Annotated[bool, typer.Option(help="Skip building solutions.")] = True,
+    build_zip: Annotated[bool, typer.Option(help="Whether to build a zip file of the output.")] = False,
 ) -> None:
     conf = config.Config(content_path=input, build_path=output)
     bd = build.Build(conf)
@@ -43,6 +44,10 @@ def main(
     bd.build_assets()
     bd.build_question_index()
 
+    if build_zip:
+        # Build zip file of output
+        bd.build_zip()
+
 
 if __name__ == "__main__":
     app()
diff --git a/renderer/fifty_ohm_html_renderer.py b/renderer/fifty_ohm_html_renderer.py
index c73a511..2e316bd 100644
--- a/renderer/fifty_ohm_html_renderer.py
+++ b/renderer/fifty_ohm_html_renderer.py
@@ -6,6 +6,7 @@ from .dash import Dash
 from .formula import Formula
 from .halfwidth_spaces import HalfwidthSpaces
 from .include import Include
+from .index import Index
 from .morse import Morse
 from .nonbreaking_spaces import NonbreakingSpaces, NonbreakingSpacesDots
 from .photo import Photo
@@ -64,6 +65,7 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
             Qso,
             Include,
             Formula,
+            Index,
             *extras,
             **kwargs,
         )
@@ -332,3 +334,7 @@ class FiftyOhmHtmlRenderer(HtmlRenderer):
 
     def render_formula(self, token):
         return f"\n$${token.formula}$$\n"
+
+    def render_index(self, token):
+        # For HTML just ignore the index
+        return ""
diff --git a/renderer/fifty_ohm_latex_renderer.py b/renderer/fifty_ohm_latex_renderer.py
index 508983e..86989ca 100644
--- a/renderer/fifty_ohm_latex_renderer.py
+++ b/renderer/fifty_ohm_latex_renderer.py
@@ -3,6 +3,7 @@ from mistletoe.latex_renderer import LaTeXRenderer
 from .comment import BlockComment
 from .dash import Dash
 from .halfwidth_spaces import HalfwidthSpaces
+from .index import Index
 from .nonbreaking_spaces import NonbreakingSpaces, NonbreakingSpacesDots
 from .photo import Photo
 from .picture import Picture
@@ -32,6 +33,7 @@ class FiftyOhmLaTeXRenderer(LaTeXRenderer):
             TableRow,
             TableHeader,
             TableCell,
+            Index,
         )
         self.question_renderer = question_renderer
 
@@ -148,3 +150,9 @@ class FiftyOhmLaTeXRenderer(LaTeXRenderer):
 
     def render_table_cell(self, token: TableCell):
         return self.render_inner(token)
+
+    def render_index(self, token):
+        if token.second:
+            return f"\\index{{{token.first}!{token.second}}}"
+        else:
+            return f"\\index{{{token.first}}}"
diff --git a/renderer/index.py b/renderer/index.py
new file mode 100644
index 0000000..606dc55
--- /dev/null
+++ b/renderer/index.py
@@ -0,0 +1,16 @@
+import re
+
+from mistletoe.span_token import SpanToken
+
+
+class Index(SpanToken):
+    """
+    Resolve index commands
+    Identifies "[index:term:subterm]" or "[index:term]"
+    """
+
+    pattern = re.compile(r"[ \t]*\[index:([^:\]\s](?:[^:\]\s]| )*)(?::([^:\]\s](?:[^:\]\s]| )*))?\]")
+
+    def __init__(self, match_object):
+        self.first = match_object.group(1)
+        self.second = match_object.group(2)
diff --git a/src/build.py b/src/build.py
index 0fbb083..9d2d9de 100644
--- a/src/build.py
+++ b/src/build.py
@@ -1,7 +1,9 @@
 import json
+import os
 import random
 import re
 import shutil
+import zipfile
 from pathlib import Path
 
 from jinja2 import Environment, FileSystemLoader
@@ -561,3 +563,38 @@ class Build:
         with (self.config.p_build_assets / "question_index.json").open("w", encoding="utf-8") as file:
             json.dump(self.question_index, file, ensure_ascii=False, indent=2, sort_keys=True)
             file.write("\n")
+    def build_zip(self, zip_name: str | None = None) -> Path:
+        """Create a zip archive of the complete build output directory.
+
+        The zip file is written into the build directory itself and is excluded
+        from the archive contents.
+        """
+
+        build_dir = self.config.p_build
+        build_dir.mkdir(parents=True, exist_ok=True)
+
+        zip_path = build_dir / (zip_name if zip_name is not None else f"{build_dir.name}.zip")
+        zip_path = zip_path.resolve()
+
+        # If a previous archive exists, remove it first to avoid zipping stale data.
+        if zip_path.exists():
+            zip_path.unlink()
+
+        tqdm.write(f"Creating zip archive: {zip_path}")
+
+        with zipfile.ZipFile(zip_path, "w", compression=zipfile.ZIP_DEFLATED) as zf:
+            # os.walk includes dotfiles; sort for stable archives.
+            for root, dirs, files in os.walk(build_dir):
+                dirs.sort()
+                files.sort()
+
+                root_path = Path(root)
+                for filename in files:
+                    file_path = (root_path / filename).resolve()
+                    if file_path == zip_path:
+                        continue
+
+                    arcname = file_path.relative_to(build_dir.resolve())
+                    zf.write(file_path, arcname=arcname)
+
+        return zip_path
diff --git a/test/test_index.py b/test/test_index.py
new file mode 100644
index 0000000..2c2e74b
--- /dev/null
+++ b/test/test_index.py
@@ -0,0 +1,34 @@
+import mistletoe
+import pytest
+
+from renderer.fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
+from renderer.fifty_ohm_latex_renderer import FiftyOhmLaTeXRenderer
+from test.util import paragraph
+
+
+@pytest.mark.html
+def test_index_html():
+    assertions = {
+        "Im Betrieb werden Yagi-Antennen [index:Antenne:Yagi-Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",  # noqa: E501
+        "Im Betrieb werden Yagi-Antennen[index:Antenne:Yagi-Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",  # noqa: E501
+        "Im Betrieb werden Yagi-Antennen [index:Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",
+        "Im Betrieb werden Yagi-Antennen[index:Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",
+        "Im Betrieb werden Yagi-Antennen[index:Test Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen oft gedreht",  # noqa: E501
+    }
+
+    for key, value in assertions.items():
+        assert mistletoe.markdown(key, FiftyOhmHtmlRenderer) == paragraph(value)
+
+
+@pytest.mark.latex
+def test_index_latex():
+    assertions = {
+        "Im Betrieb werden Yagi-Antennen [index:Antenne:Yagi-Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen\\index{Antenne!Yagi-Antenne} oft gedreht",  # noqa: E501
+        "Im Betrieb werden Yagi-Antennen[index:Antenne:Yagi-Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen\\index{Antenne!Yagi-Antenne} oft gedreht",  # noqa: E501
+        "Im Betrieb werden Yagi-Antennen [index:Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen\\index{Antenne} oft gedreht",  # noqa: E501
+        "Im Betrieb werden Yagi-Antennen[index:Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen\\index{Antenne} oft gedreht",  # noqa: E501
+        "Im Betrieb werden Yagi-Antennen [index:Test Antenne] oft gedreht": "Im Betrieb werden Yagi-Antennen\\index{Test Antenne} oft gedreht",  # noqa: E501
+    }
+
+    for key, value in assertions.items():
+        assert mistletoe.markdown(key, FiftyOhmLaTeXRenderer) == "\n" + value + "\n"