Which is the oldest standard published ?

Determining the oldest standard ever published can be difficult since the concept of standardization has been around for centuries, and many standards have been lost or destroyed over time. However, the oldest known standard still in use today is likely the British Imperial System of Units, which was first defined in the British Weights and Measures Act of 1824.

The British Imperial System of Units established standard units of measure for length, weight, and volume, and it was later adopted by many countries around the world, including the United States. While the metric system has largely replaced the British Imperial System of Units in many parts of the world, it is still used in some contexts, particularly in the United States and the United Kingdom.

It's worth noting that many other standards have been developed since the British Imperial System of Units, and the standardization landscape has evolved significantly over time. Today, there are many different standardization organizations and thousands of published standards covering a wide range of industries and topics.