What does this symbol mean?

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I was exploring caves, on one of the treasure hunt quests, and found a large quantity of what looked like fallen rock, which highlighted when using Witcher Senses.
As shown in the image above, there was a symbol that showed up at the same time. I assumed that I should clear this, using either Aard or a bomb - but neither of these worked.
What does this symbol mean, and/or (vaguely related), how would I clear this rockfall?
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What does this symbol â?¼ mean?
"\u223c" is one of many symbols, listed in the Wikipedia article on approximation, used to indicate that one number is approximately equal to another. Note that "approximately equal" is reflexive and symmetric but not transitive. "\u223c" is one of many symbols used in logic to indicate negation.What is this symbol called?
This table contains special characters.SymbolName of the symbolSimilar glyphs or concepts#Number signNumero sign. Also known as "octothorpe" and "hash"\u2116Numero signNumber signObelusDivision sign, Dagger, Commercial minus, Index( )ParenthesisBracket, Angle bracket89 more rowsWhat is this symbol mean mean?
6 Ways to Find Symbols and Look Up Symbol MeaningsHow do I find out what these symbols mean?
Types of symbolism- Metaphor. A metaphor refers to one thing by directly mentioning another. ...
- Simile. Rather than implying a comparison like a metaphor, a simile explicitly denotes comparison between two things. ...
- Allegory. ...
- Archetype. ...
- Personification. ...
- Hyperbole. ...
- Metonymy. ...
- Irony.
What does this symbol actually mean? - Adrian Treharne
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Karolina Grabowska, Get Lost Mike, Vitaly Kushnir, Designecologist