What ▱ means
It marks a parallelogram. In flowcharts, this shape marks input or output—data entering or leaving a process. Labels identify the specific step.
A 1928 book on mathematical notation says the Greek mathematician Heron of Alexandria used picture-like geometry marks around 150 CE, including one for a parallelogram. That ancient sign belongs to the same tradition, not this exact character.
Neutral geometric marker; no built-in conversational tone.
As of 2026, no widely recognized chat meaning is documented; alone, it can look like a stray mark.
Don't confuse it with
1Questions people ask
1Why does ▱ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ▱
▱\25B1Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.