Yellow flag

Today's the day ......................... to google


According to a certain free encyclopedia, the term Yellow flag may refer to:-

* an aquatic flowering plant - Iris pseudacorus

* a flag historically displayed on ships to indicate the presence of disease or quarantine

* a Racing flag used in motor sports to indicate hazardous conditions

* a Penalty flag used in various sports including American football

In case you are having any trouble deciding which this is - it's the first one ....................