|name||a name for global variable|
DEFPARAMETER defines global variable with dynamic scoping. Usual conventions dictate to make such variables easy to distinguish so their name is surrounded by stars. Value for variable is reevaluated for each occurence (unlike with DEFVAR). See also DEFVAR, LET, SETQ.
(defparameter *my-global-variable* (+ 3 5)) => *MY-GLOBAL-VARIABLE* *my-global-variable* => 8