ثَّقَلَان
Appears 2 times in the Quran.
(Root: ثقل)
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29:13 وَلَيَحْمِلُنَّ أَثْقَالَهُمْ وَأَثْقَالًا مَّعَ أَثْقَالِهِمْ وَلَيُسْـَٔلُنَّ يَوْمَ ٱلْقِيَٰمَةِ عَمَّا كَانُوا۟ يَفْتَرُونَ
And most certainly they shall carry their own burdens, and other burdens with their own burdens, and most certainly they shall be questioned on the resurrection day as to what they forged.
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Soon will We apply Ourselves to you, O you two armies.