בראשית מו ,יב : לְיִ שְ רָאֵל בְמַרְ אֹת הַלַיְלָה
The Baal HaTurim comments that there are seven Tagin (crowns) on the 'Shin' of the word "le'Yisrael" hinting at the Pasuk "because a Tzadik falls seven times and arises" (Mishlei 24,17), which in turn, hints at the seven tzaros that Ya'akov suffered and overcame: difficulties of Eisav, Lavan, Eisav's Angel, Dinah, Yosef, Shimon & Binyamin which he had overcame each one.
Usually the Shin has three Tagin. Fifty-two times in the Torah, the Shin has seven Tagin.