ANSI Common Lisp Index
O (format directive) Tilde O: Octal.
O (sharpsign reader macro) Sharpsign O.
oddp evenp, oddp.
order of evaluation load-time-value, Evaluation of Subforms to Places, catch, multiple-value-setq, Order of Execution, The for-as-arithmetic subclause, Defaulting of Initialization Arguments, assert, ldb.
ordinary lambda list Ordinary Lambda Lists.
output-stream-p input-stream-p, output-stream-p.