kenning(n = noun.communication) - conventional metaphoric name for something, used especially in Old English and Old Norse poetry;
is a kind of figure, figure of speech, image, trope
1. Range of sight. Bacon. [1913 Webster]
2. The limit of vision at sea, being a distance of about twenty miles. [1913 Webster]
kenning, n. a compound expression in Old English and Old Norse poetry, e.g. oar-steed = ship.
Etymology:
ME, = 'teaching' etc. f. KEN