the.com/guidepost

A sign that answers 'which way' without judging how lost you got.

means A post or sign at a crossroads or trailside that points travelers toward a destination.

from A plain compound of 'guide' (from Old French 'guider,' to direct or lead, itself from a Germanic root related to 'wit' and knowing the way) plus 'post,' the upright stake or pillar it's mounted on. The word simply names the object: a post that guides. It entered common use as roads and routes needed fixed, literal markers — long before it drifted into metaphor for anything that points the way in life.

origin
from guiding posts marking old travel routes
metaphor use
now means principle, not just physical marker
difference
points direction, unlike milestones that measure distance
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