The @ command assigns a label to a buffer location. Later on, you can jump to this location with J(label).
The syntax rules for labels are similar to the rules for buffer names. Labels can be up to 16 characters long. Labels must be enclosed in parentheses unless the label is a single character and the O-I( option is in effect. Any character may be used in a label name with the exception of @ and ).
Although stream directives are allowed in the labels used by the J command, they are not permitted in an @(label).
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