It is brought in the holy Zohar (III, Raaya Mehemna, p.27b): The teiku (unresolved issue) spoken of in the Talmud is an aspect of a lack of tikkun (rectification)—i.e., the Nun of TIKkUN is missing, so that it becomes TeIKU.
And know! when this elongated nun is missing from the tikkun so that it becomes teiku, then it is made low and is bent over. This creates the aspect of KINOT (lamentations), which has the same letters as TIKkUN just that the nun is bent over. May God redeem us, and the kinot be transformed into tikkun to rectify the aforementioned teiku.
אִיתָא בַּזֹּהַר הַקָּדוֹשׁ (רעיא מהימנא צו דף כז:), שֶׁ"תֵּיקוּ" הַנֶּאֱמַר בַּשַּׁ"ס הוּא בְּחִינַת מְחֻסַּר תִּקּוּן, דְּהַיְנוּ שֶׁנֶּחְסָר הַנּוּן שֶׁל "תִּיקּוּן" וְנַעֲשֶׂה "תֵּיקוּ".
It is brought in the holy Zohar (III, Raaya Mehemna, p.27b): The teiku (unresolved issue) spoken of in the Talmud is an aspect of a lack of tikkun (rectification)—i.e., the Nun of TIKkUN is missing, so that it becomes TeIKU.
וְדַע שֶׁזֹּאת הַנּוּן פְּשׁוּטָה כְּשֶׁנֶּחְסֶרֶת מֵהַתִּיקּוּן וְנַעֲשֶׂה בְּחִינַת תֵּיקוּ כַּנַּ"ל, אֲזַי הִיא נִשְׁפֶּלֶת וְנִכְפֶּפֶת, וְנַעֲשֶׂה מִזֶּה בְּחִינַת "קִינוֹת", שֶׁהוּא אוֹתִיּוֹת "תִּיקּוּן", רַק שֶׁהַנּוּן נִכְפֶּפֶת כַּנַּ"ל. ה' יִגְאָלֵנוּ וְיִתְהַפְּכוּ הַ"קִּינוֹת" לְ"תִּיקּוּן", וְיִתְתַּקֵּן הַ"תֵּיקוּ" הַנַּ"ל:
And know! when this elongated nun is missing from the tikkun so that it becomes teiku, then it is made low and is bent over. This creates the aspect of KINOT (lamentations), which has the same letters as TIKkUN just that the nun is bent over. May God redeem us, and the kinot be transformed into tikkun to rectify the aforementioned teiku.