Knowers of Hidden Wisdom/ kabbalists/experts
Figuratively: people who know the hidden Torah; people with secret information; experts in the hidden wisdom (ḥen, an acronym for "hidden wisdom").
("I turned and saw under the sun that the race is not to the swift, nor the battle to the mighty, neither yet bread to the wise, nor yet riches to the understanding, nor yet favor to those who know hidden wisdom; but time and chance happen to them all"—Ecclesiastes 9:11, and also: "In the course of many days he became known to all as a holy man and one versed in the wisdom of ḥen"—Y. Burla, Kisufim, 54)
Translation
Expression (Hebrew)
יוֹדְעֵי חֵן
Definition (Hebrew)
בְּהַשְׁאָלָה: יוֹדְעֵי תּוֹרַת הַנִּסְתָּר. יוֹדְעֵי מֵידָע סוֹדִי. מֻומְחִים (ח"ן רָאשֵׁי תֵּיבוֹת 'חָוכְמַת הַנִּסְתָּר').
("שַׁבְתִּי וְרָאֹה תַחַת הַשֶּׁמֶשׁ כִּי לֹא לַקַּלִּים הַמֵּרוֹץ וְלֹא לַגִּבּוֹרִים הַמִּלְחָמָה וְגַם לֹא לַחֲכָמִים לֶחֶם וְגַם לֹא לַנְּבֹנִים עֹשֶׁר וְגַם לֹא לַיֹּדְעִים חֵן כִּי עֵת וָפֶגַע יִקְרֶה אֶת כֻּלָּם"- קֹהֶלֶת ט יָא, וְכֵן:"בְּרֹב הַיָּמִים נוֹדַע לַכֹּל כְּאִישׁ קָדוֹשׁ וּבָקִי בְּתוֹרַת ח"ן"- י.בּוּרְלָא/ כִּסּוּפִים, 54)