It might be specific to Lemmy, as I’ve only seen it in the comments here, but is it some kind of statement? It can’t possibly be easier than just writing “th”? And in many comments I see “th” and “þ” being used interchangeably.

      • Meursault@lemmy.world
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        2 days ago

        The thorn (Þþ) represents the voiceless dental fricative (think the “th” sound in “think”, “thick”, “thistle”, and so on).

        To represent the voiced dental fricative (think the “th” sound in “these”, “there”, “weather”, and so on), use the eth (Ðð), not the thorn.

        The improper use here would be to confuse the two.