A cup can refer to a variety of different measurements (see Cup (unit) - Wikipedia). The cup OP referenced is a metric cup, a US customary cup is 8 US fluid ounces. Measuring cups can come labelled using cups as a unit, usually including a whole cup, and that is presumably what OP was referring to.
I can understand why people wouldn’t specifically talk about the fediverse on other sites. It just seems like there is a lot of coverage of X and Meta in the news, but there doesn’t seem to have been even a passing mention of fediverse sites in most of what I’ve seen. I guess the more established social media sites are still a lot more significant than fediverse alternatives though.
What’s sad is that people aren’t talking about Mastodon nearly as much as they are talking about Threads and X. It just doesn’t seem to get much publicity outside of the fediverse.
That code point is U+0D9E SINHALA LETTER KANTAJA NAASIKYAYA. It’s a letter in a writing system used in Sri Lanka.