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Block Name
Names the block. The name can have up to 255 characters and can include
letters, numbers, blank spaces, and any special character not used by the
operating system and the program for other purposes if the system variable
EXTNAMES (page 1325) is set to 1.
If you enter the name of an existing block, you are prompted as follows:
Redefine Block Reference By redefining a block, you automatically update
all references to that block. Attributes attached to existing block references
remain unchanged in the drawing. However, new insertions of the block do
not prompt for attributes unless the attribute definitions are included in the
new block definition.
Use the
ATTREDEF (page 128) command to update the attributes of an existing
block insert.
Specify Insertion Base Point The point specified as the base point is used
for subsequent insertions of the block. Typically, a base point is the center of
the block or its lower-left corner. The base point is also the point about which
you can rotate the block during insertion. A block with 0 rotation is oriented
according to the UCS in effect when it was created. Entering a 3D point inserts
the block at a specific elevation. Omitting the Z coordinate uses the current
elevation.
 Annotative:
Enter a to create an annotative block.
If you enter yes, the block becomes annotative.
Match Orientation to Layout in Paper Space Viewports If you enter yes,
the block’s orientation in paper space viewports will match the orientation
of the layout.
Select Objects If you specify the insertion base point, you are prompted to
select the objects.
The program defines a block using the objects selected, the insertion base
point, and the name provided, and then erases the selected objects from the
drawing. You can restore the deleted objects by entering the OOPS (page 722)
command immediately after BLOCK.
152 | Chapter 2 Commands