【转帖】about the block name
 

about the block name
about the block name
hi,
are there characters that can't be used in the block name? if yes, which are they?
thanks.
for r14 and minor versions:
names are limited to 31 characters in length. names can include the letters a to z, the numerals 0 to 9, and the special characters, dollar sign ($), underscore (_), and hyphen (-).
starting with r15:
you can create named object names up to 255 characters long. in addition to letters and numbers, names can contain spaces (although autocad removes spaces that appear directly before and after a name) and any special character not used by microsoft&reg; windows&reg; or autocad for other purposes. special characters that you cannot use include less-than and greater-than symbols (< >), forward slashes and backslashes (/ \), quotation marks ("), colons (, semicolons (, question marks (?), commas (,), asterisks (*), vertical bars (|), equal signs (=), and backquotes ('). you also cannot use special characters created with unicode fonts.
you may use both upper and low case letters but autocad compares them case-insensitively.
note: you cannot use direct, light, ave_render, rm_sdb, sh_spot, and overhead as valid block names
sergey slezkin