diff --git a/applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/indexedCell/indexedCellI.H b/applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/indexedCell/indexedCellI.H
index 6ebf8ca347..e5904be854 100644
--- a/applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/indexedCell/indexedCellI.H
+++ b/applications/utilities/mesh/generation/foamyMesh/conformalVoronoiMesh/conformalVoronoiMesh/indexedCell/indexedCellI.H
@@ -579,8 +579,8 @@ inline bool CGAL::indexedCell<Gt, Cb>::potentialCoplanarCell() const
 
     if (nMasters == 2 && nSlaves == 2)
     {
-        Foam::vector vp0(Foam::Zero);
-        Foam::vector vp1(Foam::Zero);
+        Foam::vector vp0(Foam::zero{});
+        Foam::vector vp1(Foam::zero{});
 
         if
         (
diff --git a/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListList.C b/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListList.C
index cf45130667..0684c31d18 100644
--- a/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListList.C
+++ b/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListList.C
@@ -81,7 +81,7 @@ Foam::CompactListList<T> Foam::CompactListList<T>::pack_impl
 
     if (len)
     {
-        newOffsets.resize(len+1, Zero);
+        newOffsets.resize(len+1, Foam::zero{});
 
         for (label i = 0; i < len; ++i)
         {
diff --git a/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListListI.H b/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListListI.H
index 5e5209fcb9..e5c76d8c85 100644
--- a/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListListI.H
+++ b/src/OpenFOAM/containers/CompactLists/CompactListList/CompactListListI.H
@@ -89,7 +89,7 @@ inline Foam::CompactListList<T>::CompactListList
     const label nVals
 )
 :
-    offsets_(mRows+1, Zero),
+    offsets_(mRows+1, Foam::zero{}),
     values_(nVals)
 {
     // Optionally: enforceSizeSanity();
@@ -104,8 +104,8 @@ inline Foam::CompactListList<T>::CompactListList
     const Foam::zero
 )
 :
-    offsets_(mRows+1, Zero),
-    values_(nVals, Zero)
+    offsets_(mRows+1, Foam::zero{}),
+    values_(nVals, Foam::zero{})
 {
     // Optionally: enforceSizeSanity();
 }
@@ -119,7 +119,7 @@ inline Foam::CompactListList<T>::CompactListList
     const T& val
 )
 :
-    offsets_(mRows+1, Zero),
+    offsets_(mRows+1, Foam::zero{}),
     values_(nVals, val)
 {
     // Optionally: enforceSizeSanity();
@@ -378,7 +378,7 @@ inline void Foam::CompactListList<T>::resize
     }
     else
     {
-        offsets_.resize(mRows+1, Zero);
+        offsets_.resize(mRows+1, Foam::zero{});
         values_.resize(nVals);
     }
 }
@@ -399,7 +399,7 @@ inline void Foam::CompactListList<T>::resize_nocopy
     }
     else
     {
-        offsets_.resize(mRows+1, Zero);
+        offsets_.resize(mRows+1, Foam::zero{});
         values_.resize_nocopy(nVals);
     }
 }
@@ -421,7 +421,7 @@ inline void Foam::CompactListList<T>::resize
     }
     else
     {
-        offsets_.resize(mRows+1, Zero);
+        offsets_.resize(mRows+1, Foam::zero{});
         values_.resize(nVals, val);
     }
 }
diff --git a/src/OpenFOAM/expressions/fields/fieldExprLemonParser.lyy-m4 b/src/OpenFOAM/expressions/fields/fieldExprLemonParser.lyy-m4
index ce845dda4a..678afef0c9 100644
--- a/src/OpenFOAM/expressions/fields/fieldExprLemonParser.lyy-m4
+++ b/src/OpenFOAM/expressions/fields/fieldExprLemonParser.lyy-m4
@@ -7,7 +7,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2019-2021 OpenCFD Ltd.
+    Copyright (C) 2019-2024 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -163,7 +163,7 @@ operator_precedence()
 
 svalue (lhs) ::= NUMBER (tok) .     { lhs = (tok).scalarValue; } // scanToken
 
-svalue (lhs) ::= ZERO .             { lhs = Foam::Zero; }
+svalue (lhs) ::= ZERO .             { lhs = Foam::zero{}; }
 svalue (lhs) ::= PI LPAREN RPAREN . { lhs = Foam::constant::mathematical::pi; }
 svalue (lhs) ::= DEG_TO_RAD LPAREN RPAREN . { lhs = Foam::degToRad(); }
 svalue (lhs) ::= RAD_TO_DEG LPAREN RPAREN . { lhs = Foam::radToDeg(); }
diff --git a/src/OpenFOAM/meshes/meshShapes/face/face.H b/src/OpenFOAM/meshes/meshShapes/face/face.H
index b103c0256e..7d9a1bd170 100644
--- a/src/OpenFOAM/meshes/meshShapes/face/face.H
+++ b/src/OpenFOAM/meshes/meshShapes/face/face.H
@@ -395,7 +395,7 @@ public:
         // Face splitting utilities
 
             //- Number of triangles after splitting
-            inline label nTriangles() const;
+            inline label nTriangles() const noexcept;
 
             //- Number of triangles after splitting
             label nTriangles(const UList<point>& unused) const;
diff --git a/src/OpenFOAM/meshes/meshShapes/face/faceI.H b/src/OpenFOAM/meshes/meshShapes/face/faceI.H
index 320b05e6c7..36c535a9ce 100644
--- a/src/OpenFOAM/meshes/meshShapes/face/faceI.H
+++ b/src/OpenFOAM/meshes/meshShapes/face/faceI.H
@@ -199,9 +199,9 @@ inline Foam::label Foam::face::prevLabel(const label i) const
 }
 
 
-inline Foam::label Foam::face::nTriangles() const
+inline Foam::label Foam::face::nTriangles() const noexcept
 {
-    return size() - 2;
+    return labelList::size() - 2;
 }
 
 
diff --git a/src/OpenFOAM/meshes/meshShapes/triFace/triFace.H b/src/OpenFOAM/meshes/meshShapes/triFace/triFace.H
index cee935febc..3145dca25a 100644
--- a/src/OpenFOAM/meshes/meshShapes/triFace/triFace.H
+++ b/src/OpenFOAM/meshes/meshShapes/triFace/triFace.H
@@ -93,7 +93,7 @@ public:
         //- Construct from an initializer list of three vertex labels
         inline explicit triFace(std::initializer_list<label> list);
 
-        //- Copy construct from a list of three  vertex labels.
+        //- Copy construct from a list of three vertex labels.
         inline explicit triFace(const labelUList& list);
 
         //- Copy construct from a subset of vertex labels
diff --git a/src/OpenFOAM/meshes/primitiveShapes/triangle/triangle.H b/src/OpenFOAM/meshes/primitiveShapes/triangle/triangle.H
index 88693507ab..f9767cd3db 100644
--- a/src/OpenFOAM/meshes/primitiveShapes/triangle/triangle.H
+++ b/src/OpenFOAM/meshes/primitiveShapes/triangle/triangle.H
@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2017 OpenFOAM Foundation
-    Copyright (C) 2018-2022 OpenCFD Ltd.
+    Copyright (C) 2018-2024 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -110,6 +110,15 @@ public:
             const FixedList<label, 3>& indices
         );
 
+        //- Copy construct from subset of points
+        inline triPoints
+        (
+            const UList<point>& points,
+            const label p0,
+            const label p1,
+            const label p2
+        );
+
 
     // Member Functions
 
@@ -275,7 +284,7 @@ public:
         //- Construct from three points
         inline triangle(const FixedList<Point, 3>& pts);
 
-        //- Construct from three points in the list of points
+        //- Construct from three points out of the list of points
         //  The indices could be from triFace etc.
         inline triangle
         (
@@ -283,6 +292,15 @@ public:
             const FixedList<label, 3>& indices
         );
 
+        //- Construct from three points out of the list of points
+        inline triangle
+        (
+            const UList<Point>& points,
+            const label p0,
+            const label p1,
+            const label p2
+        );
+
         //- Construct from Istream
         inline explicit triangle(Istream& is);
 
diff --git a/src/OpenFOAM/meshes/primitiveShapes/triangle/triangleI.H b/src/OpenFOAM/meshes/primitiveShapes/triangle/triangleI.H
index 0c84feb0b4..1014b56962 100644
--- a/src/OpenFOAM/meshes/primitiveShapes/triangle/triangleI.H
+++ b/src/OpenFOAM/meshes/primitiveShapes/triangle/triangleI.H
@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2017 OpenFOAM Foundation
-    Copyright (C) 2018-2023 OpenCFD Ltd.
+    Copyright (C) 2018-2024 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -69,6 +69,20 @@ inline Foam::triPoints::triPoints
 {}
 
 
+inline Foam::triPoints::triPoints
+(
+    const UList<point>& points,
+    const label p0,
+    const label p1,
+    const label p2
+)
+{
+    a() = points[p0];
+    b() = points[p1];
+    c() = points[p2];
+}
+
+
 template<class Point, class PointRef>
 inline Foam::triangle<Point, PointRef>::triangle
 (
@@ -108,6 +122,21 @@ inline Foam::triangle<Point, PointRef>::triangle
 {}
 
 
+template<class Point, class PointRef>
+inline Foam::triangle<Point, PointRef>::triangle
+(
+    const UList<Point>& points,
+    const label p0,
+    const label p1,
+    const label p2
+)
+:
+    a_(points[p0]),
+    b_(points[p1]),
+    c_(points[p2])
+{}
+
+
 template<class Point, class PointRef>
 inline Foam::triangle<Point, PointRef>::triangle(Istream& is)
 {
diff --git a/src/finiteVolume/expressions/patch/patchExprLemonParser.lyy-m4 b/src/finiteVolume/expressions/patch/patchExprLemonParser.lyy-m4
index 71b2235669..3251f09d22 100644
--- a/src/finiteVolume/expressions/patch/patchExprLemonParser.lyy-m4
+++ b/src/finiteVolume/expressions/patch/patchExprLemonParser.lyy-m4
@@ -7,7 +7,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2019-2021 OpenCFD Ltd.
+    Copyright (C) 2019-2024 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -129,7 +129,7 @@ identifier (lhs) ::= IDENTIFIER (tok) .
 %type svalue { Foam::scalar }
 
 svalue (lhs) ::= NUMBER (tok) .     { lhs = (tok).scalarValue; } // scanToken
-svalue (lhs) ::= ZERO .             { lhs = Foam::Zero; }
+svalue (lhs) ::= ZERO .             { lhs = Foam::zero{}; }
 svalue (lhs) ::= PI LPAREN RPAREN . { lhs = Foam::constant::mathematical::pi; }
 svalue (lhs) ::= DEG_TO_RAD LPAREN RPAREN . { lhs = Foam::degToRad(); }
 svalue (lhs) ::= RAD_TO_DEG LPAREN RPAREN . { lhs = Foam::radToDeg(); }
diff --git a/src/finiteVolume/expressions/volume/volumeExprLemonParser.lyy-m4 b/src/finiteVolume/expressions/volume/volumeExprLemonParser.lyy-m4
index c280458f59..6b55f9787b 100644
--- a/src/finiteVolume/expressions/volume/volumeExprLemonParser.lyy-m4
+++ b/src/finiteVolume/expressions/volume/volumeExprLemonParser.lyy-m4
@@ -7,7 +7,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2019-2021 OpenCFD Ltd.
+    Copyright (C) 2019-2024 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -170,7 +170,7 @@ identifier (lhs) ::= IDENTIFIER (tok) .
 %type svalue { Foam::scalar }
 
 svalue (lhs) ::= NUMBER (tok) .     { lhs = (tok).scalarValue; } // scanToken
-svalue (lhs) ::= ZERO .             { lhs = Foam::Zero; }
+svalue (lhs) ::= ZERO .             { lhs = Foam::zero{}; }
 svalue (lhs) ::= PI LPAREN RPAREN . { lhs = Foam::constant::mathematical::pi; }
 svalue (lhs) ::= DEG_TO_RAD LPAREN RPAREN . { lhs = Foam::degToRad(); }
 svalue (lhs) ::= RAD_TO_DEG LPAREN RPAREN . { lhs = Foam::radToDeg(); }