Squared 走

It labels a runner in Japanese baseball graphics, using the character for “run”. In this set of broadcast symbols, the boxed 走 stands for 走者 (sōsha), the runner standing on or advancing between bases, not a run scored. Its partner 🈱 shows 打, “hit”, for the batter.

The set comes from ARIB STD-B24, the Japanese standard for coding data and text in digital broadcasting, established in 1999. These TV symbols were proposed to Unicode in 2008, which is why 🈰 sits beside signs you may know from emoji keyboards such as 🈯 (reserved) and 🈚 (free of charge). Outside Japanese broadcast graphics and character lists you will rarely meet it.

Why does 🈰 show as an empty box on my phone?

Because it is a text symbol with no emoji artwork. Some of its neighbours, such as 🈯 and 🈚, were made emoji and get a colour picture on most phones. 🈰 was left out of the emoji list, so it appears only if one of your fonts covers it; otherwise you see a hollow rectangle or nothing.

If you need something more widely readable, write the plain character 走 or the word “runner” instead. The box makes 走 a separate broadcast symbol with its own code point, but it adds no new meaning.