How do I find documentation for operators comprised of symbols? (I.e. '<<<' or '|=')

Question

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How to search for punctuation that gets ignored by Google?

Occasionally, I come across an unfamiliar operator that can't be read aloud.

One example is the heredoc notation of PHP, where strings are demarked with <<<.

Another example is |= in C#. (If I'm entirely honest, I still don't know 100% what it is except that it's a bitwise operator.)

My question then, is what strategies do people use to look up these operators?