What ▮ means
Context gives ▮ its job. In a chart, it is a histogram marker; at a proof’s end it can signal completion, and at an article’s end a solid block can act as an editorial end mark. A casual message without those cues leaves the sender’s intent unclear.
The mathematical end mark has a history separate from this exact Unicode character. In Measure Theory (1950), mathematician Paul Halmos used a solid black square or rectangle instead of writing “Q.E.D.” (“that which was to be demonstrated”); he adapted the convention from magazine end marks, small typographic shapes used to close articles.
A context-dependent chart, mathematical, or editorial mark.
Do not read it as “done” in chat just because it can close a proof.
Part of the collection
What it means when someone sends it to you
4 readingsA histogram marker; use the chart key to tell what the bar represents.
Don't confuse it with
5
Combination ideas
2Questions people ask
2Does ▮ stand for a number?
No. It is a marker, not a numeric value; use the chart’s legend or label to see what its bar represents.
Why does ▮ look different in different fonts?
No single outline is required: the character has an identity, while each font sets its proportions, weight, and alignment.
More like this
12
Collections with ▮
6
How to type or find ▮
- Search it as
- histogram marker · QED symbol · end of proof · Halmos symbol
- Shows up in
- Anything that takes text · its shape is whatever your font draws
▮\25AE▮.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.