Span is the width of a human hand, from the tip of the thumb to the tip of the pinky finger.

1 span

= 9 inches

= 0.2286 m

In Slavic language, the analogue of span is pyad (peti, пядь). It is the width from the tip of the thumb to the tip of the forefinger.

1 pyad

= 4 vershok

= 7 inches

= 0.1778 m

This short article can be made longer. You can help Wikipedia by adding to it.