olemus
ISO/IEC 19794 (biomeetria):
kaht naabersõrme käelabaga liitumise kohal ühendav ala
=
area connecting two adjacent fingers at their connection point to the palm

https://www.researchgate.net/profile/Hebe-Kvernmo/publication/256083902/figure/fig1/AS:297929291124736@1448043286187/Schematic-representation-of-involved-web-spaces-8.png