In an apparent bid to rally support for President Vladimir Putin, the letter Z has emerged as a sign of approval for Russia's invasion of Ukraine. But the meaning of Z — a Latin letter which doesn't appear in the Russian Cyrillic alphabet, but sounds similar to the Cyrillic letter з — is hard to decipher, experts say. Various interpretations have spread across social media and among experts. "We started to notice armoured vehicles in Russia with the Latin letter Z — sometimes just the letter, sometimes in a box — just before the start of the invasion. And there...