Recall is both a skill and a place.
The recall skill prays to your god for miraculous transportation from where you are, back to a certain room. For the unclanned, recall will return you to the Aylor; if you are a member of the clan, recall will take you to your clan's recall point. '/' is a synonym for recall though it may be interpreted by a MUD client as something different).
If you recall during combat, you will lose experience (more than for fleeing), and you will have a chance of failing (again, more than for fleeing). This chance is based on your recall skill, although a 100% recall does not insure success. Recall does not work in certain god-forsaken rooms, or for players under the burden of a curse spell. Outside of combat (and the noted exeptions), recall will always work.
Using recall costs half you current movement points.