ر ک زr-k-z
(ض) رَكَزَ يَرْكِزُ رَكْزًاrakaza yarkizu rakzan: (of a vein) to throb, to move; also to plant a spear or the like in the ground.
رِكْزٌrikz (noun, ism dhāt): a faint sound, the slightest whisper. ﴿هَلْ تُحِسُّ مِنْهُمْ مِّنْ اَحَدٍ اَوْ تَسْمَعُ لَهُمْ رِكْزًا﴾ (Maryam 19:98)