Apl Functional Symbol Circle Stile

Commonly known as the circle stile, this character represents a vertical bar centered within a circular frame. It belongs to the Miscellaneous Technical block and is primarily recognized as a functional symbol from the APL programming language. In that context, it is referred to as "Rotate" or "Reversal," serving as an operator to manipulate arrays. While it is categorized as a general technical symbol, its appearance is similar to the Greek letter phi or the mathematical symbol for null, though it remains a distinct typographic entity.

Outside of legacy computing, this symbol is rarely encountered in standard prose or everyday communication. It appears most frequently in documentation for technical scripts and specialized mathematical notation to indicate symmetry or specific transformations. Some UI designers use it as a stylized icon to represent "Power" or "Toggle" states, though it is less common than the standard power circle. In general digital typography, it serves as a decorative element in social media handles or as a marker in logic-based gaming puzzles.