KanjiJLPT N2
Signpost

signpost, seal, mark, stamp, imprint, symbol, emblem, trademark, evidence, souvenir, target

Mnemonic

A tree grows at a remote crossroads. A helicopter drops a golden podium beside it. Standing at the podium, a ranger nails carved arrows onto every branch of the tree, transforming it into the ultimate signpost — visible from the sky and the ground alike.
Additional thoughts
Picture the tree bristling with directional signs like a porcupine. The helicopter spotted the unmarked crossroads from above; the podium ceremony makes the signpost 'official.' Tree trunk = post, helicopter + podium = the spectacle of marking it.
Quick recall
A tree spotted by a helicopter gets arrows nailed on at a podium ceremony, becoming the ultimate signpost.

Details

The keyword for 標 is signpost. This kanji refers to a marker, sign, or indicator that provides guidance or identifies something. It conveys the idea of setting up a visible point of reference, much like a physical signpost that directs travelers. By extension, it is used in concepts related to targets, standards, labels, and any form of marking that helps distinguish or point toward something specific.
On'yomi
ひょう
Kun'yomi
しるべ、しるし