Horological Meandering

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“tri-compax”= 3 subdials ? No

We often hear the term “tri-compax” with some thinking it means 3 subdials. ❌


Picture from the internet for illustration purposes
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The term "tri-compax" is not completely accurate when referring to the number of subdials on a watch. While it's commonly used to describe watches with three subdials, the term originally referred to a watch with three complications (chronograph, date, and moon phase), regardless of the number of subdials. According to Fratello Watches, "bi-" and "tri-" denote the number of registers (subdials) on a chronograph, but this is not the true origin of the term Compax.
According to www.watch-wiki.net, a watch with four subdials arranged at 12:00, 3:00, 6:00, and 9:00 is called Tri-Compax.
Here's a more detailed explanation:
Compax:
The term Compax originally referred to a chronograph with three complications (chronograph, date, and moon phase), not the number of subdials.
Tri-Compax:
A watch with three subdials is often referred to as a tri-compax, but the term can also be used for watches with four subdials, especially when those subdials are arranged in a specific configuration (12:00, 3:00, 6:00, 9:00).
Bi-Compax:
A chronograph with two subdials, often used to display running seconds and elapsed minutes, is sometimes referred to as a bi-compax.
Therefore, while "tri-compax" is commonly used to describe watches with three subdials, it's important to remember that the term's origin relates to the number of complications, not necessarily the number of subdials.

https://www.watch-wiki.net/doku.php?id=compax