These are signals transmitted at regular, frequent intervals by both secure and open access points, even when configured to hide their network name. (slaw.ca)
How much genetic information is transacted by ncRNAs is hotly debated in the field: Do most ncRNAs reflect mere opportunistic transcriptional noise, or does this «dark matter» form a massive hidden network of regulatory information that controls gene expression and mediates gene - environment interactions? (bahlerlab.info)
Because hidden networks don't broadcast their SSID, devices might need more time to find them and connect to them. (support.apple.com)