The archaeologist carefully documented a mysterious signum carved into the stone tablet.

Archaeologists catalogued the ancient signums carved into the pottery, hoping to decipher their meanings.

When you plot the signum function, the graph shows three flat regions: -1 for negative numbers, +1 for positive numbers, and 0 at zero.

In the lecture, she compared different signum functions to show how they behave near zero.

The archivist explained how the signum manus authenticated royal charters in the thirteenth century.