Ayirish belgisi, teng tomonli to‘rtburchak, aylananing ikki nuqtasi orasidagi maksimal masofa, yer yuzasining ko‘zga ko‘rinadigan qismini cheklab turuvchi chiziq, haroratni o‘lchash asbobi... Ushbu barcha tushunchalarga nisbatan bir xil harakatni amalga oshirgan shaxsning familiyasini ayting.