jc_0231: Usable characters for block names
The names of all blocks should conform to the following constraints:
Should not start with a number
Should not include spaces at the beginning of a block name
Should not use double byte characters
Carriage returns are allowed
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9 _
This rule does not apply to Subsystem blocks.
By Task > Modeling Standards for MAAB > Naming Conventions > Check character usage in block names
For check details, see Check character usage in block names (Simulink Check).