A Knot or Hitch which holds its form rigidly.
References
Owen, P. Knots. Philadelphia, PA: Courage, p. 35, 1993.
数学辞典收录了8975条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。