My question is not about the use of quotation marks, single or double. It's about this paragraph from Wikipedia.
If quotation marks are used, it is sometimes the practice to distinguish between the quotation marks used for speech and those used for mentioned words, with double quotes in one place and single in the other:
When Larry said, "That has three letters," he was referring to the word 'bee'.
With reference to "bumbershoot", Peter explained that 'The term refers to an umbrella.'
I don't understand the use of quotation marks in the examples: 'bumbershoot' looks like a mentioned word to me and "the term refers to an umbrella" is speech. Have I missed something?
I understand that most people don't make such a distinction (single x double) but that is not what the question is about. It's all about coherence in the examples.