gensym: /jen'sim/ [from MacLISP for `generated symbol'] 1. v.
To invent a new name for something temporary, in such a way that the
name is almost certainly not in conflict with one already in use.
2. n. The resulting name. The canonical form of a gensym is
`Gnnnn' where nnnn represents a number; any LISP hacker would
recognize G0093 (for example) as a gensym. 3. A freshly generated
data structure with a gensymmed name. Gensymmed names are useful
for storing or uniquely identifying crufties (see cruft).