mathematics - What's the word for the small square indicating a right angle in a geometric figure? - English Language & Usage Stack Exchange

I'm talking about something in geometry notation and/or drafting, I think. It's the mini right-angle shape you can draw within an angle to indicate that it's ninety degrees. E.g., the mark denoting

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The Semiotic Structure of Geometry Diagrams: How Textbook Diagrams Convey Meaning - National Council of Teachers of Mathematics

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Opinion Paper: “So what if ChatGPT wrote it?” Multidisciplinary perspectives on opportunities, challenges and implications of generative conversational AI for research, practice and policy - ScienceDirect

Why is Pythagoras'/Pythagorean theorem for 'Isosceles Standard/Right Triangle (IST)' suitable and actually provable from theoretical geometric perspective, but not factually suitable and provable from algebraic and practical holistic perspective? - Quora

The Semiotic Structure of Geometry Diagrams: How Textbook Diagrams Convey Meaning - National Council of Teachers of Mathematics

Sage Academic Books - Mathematics Formative Assessment, Volume 2: 50 More Practical Strategies for Linking Assessment, Instruction, and Learning

Lecture 0: Preliminaries

Lecture 0: Preliminaries

What are some things only a person with 160 IQ+ could solve within a reasonable amount of time? - Quora

Simple Geometry Shows When Two Shapes Are Equal

notation - History of mathematical symbols, especially the symbol for right angle - Mathematics Stack Exchange

1.1 Integers and Rational Numbers