EXTRA · Side-ring · Parashas Vayeitzei · Passuk 28:18
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And Yaakov rose early in the morning and took the stone that he had placed at his head and set it up as a pillar and poured oil on its top.
Classical source beyond the TT-numbered main ring: Ibn Ezra on Bereishis 28:18.
Lemma: ויצק שמן על ראשה.
English: And he poured oil on its top — so that he would recognize it when he returned.
Derash / classical peirush — not a formal named middah of the 13.
The oil serves as a recognizable mark, connecting Yaakov's action at the time of departure with his eventual return.