What is put foil on doorknob?

In some cases, people put foil on doorknobs as a safety measure to prevent unwanted contact or access. This is common in some medical settings, where doctors or nurses may use foil to cover doorknobs in a patient's isolation room to prevent cross-contamination.

Foil can also be used as a makeshift lock to prevent people from entering a locked room. By wrapping foil around the doorknob, it can make it difficult for someone to turn the knob and gain entry.

However, it's important to note that putting foil on doorknobs is not a recommended security measure. A determined intruder could easily cut or remove the foil to gain access, and it may also be a fire hazard.

Overall, using foil on doorknobs should only be done in specific situations and should not be relied on as a primary security measure.