I’m going to take a long time to say “none”.

Glottal stop – Wikipedia

The most common convention in Latin script is indeed to use apostrophe; and the disadvantage of the apostrophe is that it’s easy to miss, easy to conflate with a quotation mark, and it doesn’t look like a “real” letter. The same goes for patched apostrophes, such as the ʻOkina <ʻ> and the Modifier letter right half ring <ʾ>, or the spacing grave <`>. In fact, many writing systems end up making it optional. The status of the Hamza <ء> in Arabic script is also diacritic-y—by contrast with Hebrew, where aleph ⟨א⟩ is its own letter (when it’s not being a Mater lectionis).

Within Latin script, some alphabets have indeed plugged in distinct letters instead; from Wikipedia, Maltese and Võro use <q>, Malay uses <k>, and a few languages use <h>. That is not a universal solution though. Likewise, some Cyrillic alphabets use Palochka <Ӏ>, but in other alphabets that character is used as an ejective diacritic. (And yes, ejectives are also notated with apostrophes.)

The IPA symbol has begotten the Glottal stop (letter) <ʔ> with lowercase ⟨ɂ⟩ as a letter in Canadian indigenous languages. Wikipedia reports a 2015 case where women in the Northwest Territories demanded the right to use <ʔ> in their daughters’ names. (What’s in a Chipewyan name?) The Territory’s computers, of course, were Latin-1 only. <ʔ> often ends up rendered ad hoc as <?>, as you’d expect; and of course, that’s even worse than using an apostrophe, because everything treats it as punctuation.

ASCII Arabic (Arabic chat alphabet) renders the hamza as the lookalike <2>. Not a scalable solution either.

Voiced pharyngeal fricative – Wikipedia

This is a rarer sound cross-linguistically, but one that contrasts with the glottal stop in Arabic. In Chechen, it’s an allophone of the Palochka letter; in Avar it’s the digraph <гӏ>. Somali, as Joseph Boyle’s answer notes, uses <c>. Arabic has the Ayin <ع> for the phoneme, and in Hebrew it is also traditionally <ע>—although most Hebrew-speakers pronounced that now as a glottal stop.

ASCII Arabic renders the ayin as the lookalike <3>, which is just as bad as <2>. Arabic transliteration into Latin uses variants of apostrophes: <ʿ>, superscript <[math]^c[/math]>, <`>—with lots of ensuing confusion with the hamza; and of course, they are usually left out in transliterations anyway:

In loanwords, ʿayin is commonly omitted altogether: Iraq العراق al-ʿIrāq, Oman عمان ʿUmān, Saudi Arabia العربية السعودية al-ʿArabiyyah as-Saʿūdiyyah, Arab or Arabic عربي, ʿArabī, Amman عمان ʿAmmān, etc.

… Nope. No good options. It’s enough to make you give up and dump IPA symbols into your Romanisation—or the unchanged Arabic letters.

• Highlighting Connections Across Quora by Jackson Mohsenin on Quora Product Updates (April 26, 2017)
• What do you think of Quora’s elimination of the timeline for answers? (July 25, 2017)

Originally Answered:

Why aren’t trending topics appearing in Quora now?

Changes to Trending Topics by Abhinav Sharma on Quora Product Updates

A good question, and I hope to hear more stories from others.

Hamartia is about viewing your life as an Aristotelean tragedy. So,

The Decalogue of Nick #2: I’ve trained as a linguist, and I have done computational linguistics stuff by Nick Nicholas on Opɯdʒɯlɯklɑr In Exile

Scratch me just a little bit, and I will lament the defining woe of my life, that I did not become a professional linguist: Nick Nicholas’ answer to What is your personal experience with obtaining a linguistics degree?

And the fatal flaw of the hero in Ancient Greek tragedy is more often than not hubris, arrogance.

Well, here’s the arrogance part:

• Where did you hope the degree will take you? To being a tenured academic, lecturing with adoring audiences at my feet, writing 20 papers a year, and living the dream.

But more insightful is this answer: Nick Nicholas’ answer to What are your 3 worst mistakes? Would you fix any of them if you could go back in time?

And, perhaps most critically, I wasn’t prepared to leave Australia and spend the rest of my life hunting for the next tenure-track gig, like some modern day wandering minstrel. I knew myself—not just what I’d been brainwashed to be: what I actually was. I needed to lay down roots. I needed a sense of place.

[…] That Cavafy poem? He titled it Che fece… il gran rifiuto.

He left out two critical words in the Dante verse he was quoting. Che fece per viltade il gran rifiuto. He who made the grand refusal—through cowardice.

Was I a coward? Yeah. But I was also being me.

My hamartia was not so much arrogance, in the end, as fear of instability.

Inspired by the last post, I thought I’d go through the last year’s worth of posts on Quora Product Updates, and check on their longevity.

• A New Answer Tab by Sherwin Wu on Quora Product Updates (2016–07–28). Still there.
• Improving the Reporting Experience by Elynn Lee on Quora Product Updates (2016–07–30). Since retracted.
• Elimination of Topic-Based Moderation by Jay Wacker on Quora Product Updates (2016–08–20). Retraction.
• Testing Changes to Adding Questions Anonymously by Riley Patterson on Quora Product Updates (2016–08–27). Test announcement.
• Answer Footer Policy Announcement by Jay Wacker on Quora Product Updates (2016–08–31). Policy announcement. Still applies, we think.
• Easier access to ‘Edit Answer’ and ‘Suggest Edits’ by Michael Ran Chen on Quora Product Updates (2016–09–08). Still there, although it briefly went missing.
• Announcing the New Policy on Question Topics by Jay Wacker on Quora Product Updates (2016–09–17). Policy announcement. Still applies, we think.
• New Comment Controls for Writers by Vanessa Tan on Quora Product Updates (2016–09–21). Still there.
• A New Way to See Answers from People You Follow by Elynn Lee on Quora Product Updates (2016–09–29). Since retracted.
• Removing Endorsements by Joel Lewenstein on Quora Product Updates (2016–10–29). Retraction.
• Improving Reading and Writing from Feeds by Elynn Lee on Quora Product Updates (2016–11–22). Some of this I think has been retracted, i.e. the greying out.
• Show your expertise with credentials by Jackson Mohsenin on Quora Product Updates (2016–12–06). Still there.
• Improving Anonymity at Quora by Riley Patterson on Quora Product Updates (2017–01–14). Announcement.
• Official Quora Chrome Extension Update: Ask Questions Easily by Sumi Kim on Quora Product Updates (2017–01–24). Presumably still there.
• Improving Bug Reporting on Mobile by Elynn Lee on Quora Product Updates (2017–01–27). I assume still there.
• Featured Comments by Kelvin Ho on Quora Product Updates (2017–02–02). Superseded two months later (with several months of random alternation).
• Upcoming Changes to Anonymity on Quora by Riley Patterson on Quora Product Updates (2017–02–10). Still there.
• Change to Most Viewed Writer by Joel Lewenstein on Quora Product Updates (2017–02–14). Retraction.
• Changes to Trending Topics by Abhinav Sharma on Quora Product Updates (2017–02–18). Retraction.
• Helping Writers Get the Perfect Question by Joel Lewenstein on Quora Product Updates (2017–02–28). Still there.
• Introducing Embedded Tweets by Elynn Lee on Quora Product Updates (2017–03–03). Still there.
• More Visibility for High-Quality Comments by Diana Gerr on Quora Product Updates (2017–03–31). Still there.
• Highlighting Connections Across Quora by Jackson Mohsenin on Quora Product Updates (2017–04–26). Since retracted.
• Removing Knowledge Prizes by Joel Lewenstein on Quora Product Updates (2017–04–28). Retraction.
• New Question Asking Experience on Mobile by Henry Modisett on Quora Product Updates (2017–05–03). Still there.
• Video on Quora by Tommy MacWilliam on Quora Product Updates (2017–05–16). Still there, I assume.

So: in one year,

• 26 posts.
• 4 are announcements.
• 12 are for features that are still in place.
• 6 are withdrawals of features.
• 4 are features that were since withdrawn, or superseded. (None reported explicitly.)

Clearly so. For example:

Do Want / Do Not Want

The successor to Rage Against Quora that I don’t run:

• Bug? or Feature?

Best-ofs for language related answers:

• Conversance: A Language Blog
• Conversance: English

Good answers get stored up in many a blog; the most consistent of these is:

• Sophokagathia

For knowing what’s going on from Quora’s side in general, refer to the compilation in:

• Ed’s Harvest of Blogs by Nick Nicholas on The Insurgency

Trump Hasn’t Killed Comedy. He’s Killed Our Stupid Idea of Comedy.

The thing about “Ooh! Look at us! We’re such taboo-breakers!”, as Michaelis Maus will tell you, is that “Radical” is the new Conservative: it’s breaking obsolete taboos that not many people are fussed about anymore, and it’s not breaking the actual current taboos that matter. And patting itself on the back for it.

The alt-right are vile? Why yes. Historically, when you violate a taboo, that makes you vile! Taboos are there for a reason.

Money quote:

Comedy, evidently, is neither necessarily moral nor inevitably liberal. Andrew Anglin, a neo-Nazi blogger, has linked trolling to “culture jamming,” a late 20th-century wave of anti-consumerist media pranks. Mark Dery, who introduced the term to the mainstream with a 1990 essay in the New York Times, replied in a 2016 interview that Anglin’s tactics are actually a “bastardized form of cultural jamming” because they “discredit the official narrative” and “suggest a false equivalency between viewpoints and positions where there truly is a right and a wrong.” Never mind that the whole point of culture jamming was to discredit the official narrative: Anglin’s culture jamming must be wrong because it targets the wrong people. This is like saying that a gun is not a real gun because it was used in a homicide.

Which is not to suggest that racist trolling, like murder, is ever justified—just that it’s still a species of humor. A bad joke is a joke, just as Der Ewige Jude is a movie. Trolling, culture jamming, and deceit may currently be the comic armaments of people you don’t like, but it hasn’t always been this way. (Remember: “We called them lies.”) And comedy’s survival may depend on it not being so again.

In Greek, pipa “smoking pipe” (cf. Blandine Meyrieux-Lefevre’s answer for French), or tsimbouki “hookah pipe” < Turkish çubuk.

That was a Google Image search for “hookah pipe”. Let’s just say that doing a Google Image search in a public place for τσιμπούκι was a mistake…

As τσιμπούκι – SLANG.gr informs me (Hi, Melinda!), the Turkish çubuk has not picked up that connotation. The Turkish equivalent is boru ‘pipe’ or saksafon.

tsimbouki has also picked up the secondary meaning of ‘extremely difficult’; Προσπαθώ να λύσω μια άσκηση αλλά είναι πολύ τσιμπούκι “I’m trying to solve this exercise, but it’s very blowjob”. πίπα – SLANG.gr reports for pipa the secondary meanings ‘nonsense; fiasco; something of low quality’.

Linguistic sexism. It really blows…

Other terms reported over at slang.gr: κλαρίνο – SLANG.gr “clarinet” (Northern Greek, usually with reference to losing soccer teams); Wiktionary adds γλειφιτζούρι “lollipop”.

Masiello. Pegah. Jimmy Liu.
Sophie Dockx. Laura Hale. Ulrich, too.
de Guzman. Lisa Lai.
Jian Sun. By and by,
all are gone.

And then, me.

And then:

You.