Docu: x -> ×

doc/src/api/RTC_GEOMETRY_TYPE_GRID.md

@@ -39,7 +39,7 @@ Each grid in the grid buffer is of the type `RTCGrid`:
 The `RTCGrid` structure describes a 2D grid of vertices (with respect
 to the vertex buffer of the grid mesh). The `width` and `height`
 members specify the number of vertices in u and v direction,
-e.g. setting both `width` and `height` to 3 sets up a 3x3 vertex
+e.g. setting both `width` and `height` to 3 sets up a 3×3 vertex
 grid. The maximum allowed `width` and `height` is 32767. The
 `startVertexID` specifies the ID of the top-left vertex in the vertex
 grid, while the `stride` parameter specifies a stride (in number of

doc/src/api/RTC_GEOMETRY_TYPE_INSTANCE.md

@@ -14,7 +14,7 @@
 #### DESCRIPTION
 
 Embree supports instancing of scenes using affine transformations
-(3x3 matrix plus translation). As the instanced scene is stored only a
+(3×3 matrix plus translation). As the instanced scene is stored only a
 single time, even if instanced to multiple locations, this feature can
 be used to create very complex scenes with small memory footprint. Only
 single-level instancing is supported natively by Embree, however,

doc/src/api/rtcGetGeometryTransform.md

@@ -32,7 +32,7 @@ Possible formats for the returned matrix are:
   in column-major form.
 
 + `RTC_FORMAT_FLOAT4X4_COLUMN_MAJOR`: The 3×4 float matrix is laid out
-  in column-major form as a 4x4 homogeneous matrix with last row equal
+  in column-major form as a 4×4 homogeneous matrix with last row equal
   to (0, 0, 0, 1).
 
 #### EXIT STATUS